TN State Board Class 9 Lesson 10 Matter Around Us

I. Choose the correct answer.

Question 1.
The separation of denser particles from lighter particles done by rotation at high speed is called ………………..
(a) Filtration
(b) sedimentation
(c) decantation
(d) centrifugation
Answer:
(d) centrifugation

Question 2.
Among the following ………………… is a mixture.
(a) Common salt
(b) Juice
(c) Carbon dioxide
(d) Pure silver
Answer:
(b) Juice

Question 3.
When we mix a drop of ink in water we get a …………………..
(a) Heterogeneous Mixture
(b) Homogeneous Mixture
(c) Compound
(d) Suspension
Answer:
(b) Homogeneous Mixture

Question 4.
…………… is essential to perform separation by solvent extraction method.
(a) Separating funnel
(b) Centrifuge machine
(c) Filter paper
(d) Sieves
Answer:
(a) Separating funnel

Question 5
…………… has the same properties throughout the sample.
(a) Pure substance
(b) Mixture
(c) Colloid
(d) Suspension
Answer:
(a) Pure substance

II. State whether the following statements are true or false. If false give the correct statement.

1. Oil and water immiscible in each other – True
2. A compound cannot be broken, into simpler substances chemically – False.
   Correct Statement: A compound can be broken into simpler substances chemically.
3. Liquid – liquid colloids are called gels – False
   Correct Statement: Liquid – solid colloids are called gels.
4. Buttermilk is an example of heterogeneous mixture – True
5. Aspirin is composed of 60% Carbon, 4.5% Hydrogen and 35.5% Oxygen by mass. Aspirin is a mixture – False.
   Correct Statement: The constituents of Aspirin are present in a fixed ratio by mass. So it is a Compound.

III. Match the following.

S.No.	A	B
1.	Element	(a) Settles down on standing
2.	Compound	(b) Impure substance
3.	Colloid	(c) Made up of molecules
4.	Suspension	(d) Pure substances
5.	Mixture	(e) Made up of atoms

(e) Made up of atomsAnswer:

1. (c) Made up of molecules
2. (b) Impure substance
3. (a) Settles down on standing
4. (d) Pure substances

IV. Fill in the blanks.

1. A mixture has no distinguishable boundary between its components.
2. An example of a substance that sublimes is
3. Alcohol can be separated from water by
4. In petroleum refining, the method of separation used is
5. Chromatography is based on the principle of

Answer:

1. homogeneous
2. Naphthalene
3. distillation
4. fractional distillation
5. absorptions

V. Very short answers.

Question 1.
Differentiate between absorption and adsorption.

Absorption	Adsorption
It is the process by which atoms, molecules, or ions enter a bulk phase (liquid, gas, solid)	It is the adhesion of atoms, ions or molecules from a gas, liquid or dissolved solid to a surface

Answer:
Absorption Adsorption
It is the process by which atoms, molecules, or ions enter a bulk phase (liquid, gas, solid) It is the adhesion of atoms, ions or molecules from a gas, liquid or dissolved solid to a surface

Question 2.
Define sublimation.
Answer:
Certain solids change directly to a gas without passing through the liquid is called sublimation.

Question 3.
A few drops of ‘Dettol’ when added to water the mixture turns turbid. Why?
Answer:
The mixture turns turbid, because of emulsion,
(Disperse phase and Dispersion medium are liquid).

Question 4.
Name the apparatus that you will use of separate the components of mixtures containing two,

1. Miscible liquids,
2. Immiscible liquids

Answer:

1. Miscible liquids – Fractional distillation (Fractionating column and Liebig) Condenser
2. Immiscible liquids – Separating funnel

Question 5.
Name the components in each of the following mixtures.

1. Ice cream
2. Lemonade
3. Air
4. Soil

Answer:

1. The main constituents of ice cream are fat, milk solids (skim-milk powder), sugar, gelatin, egg and flavouring.
2. Lemonade is a mixture of lemon juice, sugar and water.
3. Air is a mixture of nitrogen, oxygen, carbon dioxide, water vapour and other gases.
4. Soil is a mixture of clay, sand and various salts.

VI. Short answers.

Question 1.
Which of the following are pure substances? Ice, Milk, Iron, Hydrochloric acid, Mercury, Brick and Water.
Answer:
Ice, Iron, Hydrochloric acid, Mercury and water are pure substances.

Question 2.
Oxygen is very essential for us to live. It forms 21% of air by volume. Is it an element or compound?
Answer:
Oxygen is an element. It contains the atoms of oxygen of the same kind.

Question 3.
You have just won a medal made of 22-carat gold. Have you just procured a pure substance or impure substance?
Answer:
I have procured an impure substance. It is made of 22 parts of pure gold and 2 parts of copper or silver.

Question 4.
How will you separate a mixture containing saw dust, naphthalene and iron filings?
Answer:
When a magnet is brought near the mixture containing saw dust naphthalene and iron filings, it attracts the iron filings. Thus iron filings are separated.

The mixture of naphthalene and saw dust are put in a china dish and covered with a perforated asbestos sheet. An inverted funnel is placed over the asbestos sheet.

The open end of the stem of the funnel is closed, using cotton wool. The china dish is heated. The pure vapours of naphthalene solid pass through the holes in the asbestos sheet and condense on the inner side of the funnel. The saw dust is left in the china dish.

Question 5.
How are homogenous solutions different from heterogeneous solution? Explain with examples.
Answer:

S.No.	Homogeneous solutions	Heterogeneous solutions
1.	Components are uniformly mixed.	Components arc not uniformly mixed.
2.	It has single phase.	It has two or more distinct phases.
3.	No boundaries of separation between the components.	There are visible boundaries between the components.
4.	Components are invisible to naked eye.	Components are visible to naked eye.
5.	Examples of Homogeneous solutions are salt solution, lemonade, petrol etc.	Examples of Heterogeneous solutions are chalk in water, petrol in water, and sand in water.

VII. Long Answer.

Question 1.
Write the differences between elements and compounds and give an example for each.
Answer:

S.No.	Elements	Compounds
1.	Contains only one kind of atoms.	Contains more than one kind of atoms.
2.	It is a pure substance.	It is not a pure substance.
3	Elements cannot be broken down further into simpler substances by chemical methods.	Compounds can be broken down further into simpler substances by chemical methods.
4	Elements have definite physical and chemical properties.	Compounds have definite physical and chemical properties.
5	Examples for elements: oxygen 07, hydrogen H7, sodium Na.	Examples for compounds, water H70, cane sugar Cp

Question 2.
Explain Tyndall effect and Brownian movement with suitable diagram.
A. Tyndall Effect:

When a strong beam of light is focused on a colloidal solution the path of the beam becomes visible.
This phenomenon is called as Tyndall effect. The illuminated path is called Tyndall cone. This phenomenon is due to scattering of light by colloidal particles.

B. Brownian movement:

It is a kinetic property. When colloidal solution are viewed under powerful microscope, it can be seen that colloidal particles are moving constantly and rapidly in zig-zag directions. The Brownian movement of particles is due to the unbalanced bombardment of the particles by the molecules of dispersion medium.

Question 3.
How is a mixture of common salt, oil and water separated?
You can use a combination of different methods.
Answer:
The mixture of common salt, oil and water are taken in a beaker. The salt dissolves in water. Allow it to stand for a few minutes. The mixture of two immiscible liquids is separated by a separating funnel. The oil floats on top. The water can carefully be separated by opening the stopcock in the separating funnel. The oil is left behind in the separating funnel.

The salt water is heated slowly, in a distillation flask with a water condenser. The pure water vapour passes through the inner tube of the condenser.

The vapours on cooling condense into pure water and are collected in a receiver. The salt is left behind in the flask as a residue.

Activity

Question 1.
Make models of the molecules of compounds by using match sticks and clay balls as shown below,

Items for identification	Matters	Non matters
Flowers, bee, cloud, rainbow, leaf, fire, baby, torchlight, sky, smoke, heat coming from glowing coals, fog, the sound coming from a drum, a laser beam

Answer:

Items for identification	Matters	Non matters
Flowers, bee, cloud, rainbow, leaf, fire, baby, torch light, sky, smoke, heat coming from glowing coals, fog, sound coming from a drum, laser beam	Flowers	rainbow
	bee	torch light
	cloud,	sound coming from a drum
	leaf	laser beam
	baby	heat coming from glowing coals
	fog
	fire

Question 2.
Take some powdered iron filings and mix it with sulphur.

1. Divide the mixture into two equal halves.
2. Keep the first half of the mixture as it is, but heat the second half of the mixture.
3. You will get a grey brittle compound.

Answer:
Iron + Sulphur \(\stackrel{\Delta}{\longrightarrow}\) Iron sulphide
We cannot separate iron from iron sulphide. So, it is a compound, whereas Iron and Sulphur are mixtures. We can separate it by magnetic separation method.

Question 3.
Identify whether the given substance is mixture or compound and justify your answer.

S.No.	Substance	Mixture / Compound
1.	Sand and water
2.	Sand and iron filings
3.	Concrete
4.	Water and oil
5.	Salad
6.	Water
7.	Carbon dioxide
8.	Cement
9.	Alcohol

Answer:

S.No.	Substance	Mixture / Compound	Justification
1.	Sand and water	Mixture	Can be separated by filtration.
2.	Sand and iron filings	Mixture	Can be separated by a magnet.
3.	Concrete	Mixture	Ingredients are mixed together and it can be separated.
4.	Water and oil	Mixture	Oil is less dense. So floats in water and it can be separated.
5.	Salad	Mixture	Vegetable are mixed. Can be separated easily.
6.	Water	Compound	Hydrogen and oxygen are combined chemically in a fixed proportion.
7.	Carbon dioxide	Compound	Two oxygen atoms are bonded or chemically combine with carbon atom.
8.	Cement	Compound	Different elements are combined together in a fixed proportion.
9.	Alcohol	Mixture	Two or more liquids, whose proportion can be altered by distillation.

II. Match the following.

Answer:

1. (c) Hidden heat
2. (f) Colloid
3. (g) Flows freely
4. (e) Homogenous mixture
5. (b) Heterogeneous mixture
6. (d) Fractional distillation
7. (a) Separating funnel

III. State which the following statements are true or false. If false give the correct statement.

1. Supernatant denotes the heterogeneous mixture, lying above a solid residue, after crystallization, precipitation, centrifugation or other process – False.
   Correct Statement: Supernatant denotes the liquid lying above a solid residue after crystallization, precipitation, centrifugation or other process.
2. Liquids cannot be compressed and they have fixed volume – True
3. The intensity of scattered light depends on the type of colloidal solution and the size of the colloidal particles – True
4. In Aerosol the dispersed phase is liquid and the dispersion medium is gas – False.
   Correct Statement: In Aerosol, The dispersed phase is solid and the dispersion medium is gas.
5. When the solid (Solute) dissolves in a liquid (Solvent), it become a solution – True
6. Solids possess very high kinetic energy – False.
   Correct Statement: Gases possess very high kinetic energy.
7. Celsius scale is a scale of temperature in which zero represents the melting point of ice and 100 represents the boiling point of water – True

IV. Answer very shortly.

Question 1.
What is a matter?
Answer:
Anything which has mass and occupies space (volume) is called matter.

Question 2.
What is dry ice or cardice?
Answer:
Frozen carbon dioxide, is dry ice or cardice.

Question 3.
What are the uses of dry ice?
Answer:

1. Act as a cooling agent
2. Industrial refrigeration
3. Transporting frozen food.
4. It does not leave any liquid behind, as it directly changes into gas.

Question 4.
When does the pressure of the gas increase?
Answer:
When the volume of the gas decreases, the gas gets compressed. The particles of the gas have only lesser space to move around. So the particles start hitting on the walls of the container and the pressure of the gas increases.

Question 5.
Complete the following table:

S.No.	CELSIUS	KELVIN
1.	90°C	363 K
2.	?	283 K
3.	63 °C	?
4.	250°C	?
5.	?	303 K

Solution:

S.No.	CELSIUS	KELVIN
1.	90°C	363 K
2.	9.85°C	283 K
3.	63 °C	336.15K
4.	250°C	523.15 K
5.	29.85°C	303 K

Question 6.
What does the LPG (Liquefied petroleum gas) contain?
Answer:
LPG is a highly inflammable hydrocarbon. It contains a mixture of butane and propane gases.

Question 7.
What are pure substances? Give examples.
Answer:
Pure substances contain only one kind of particles.
Eg: 1. Element (Sodium, Bromine, and Hydrogen)
2. Compound (Sodium chloride, water, carbon dioxide)

Question 8.
What are impure substances? Give examples.
Answer:
Impure substances contain more than one kind of particles.
Eg: Mixtures (Gun powder, which is a mixture of sulphur potassium nitrate and charcoal)

Question 9.
Classify the pure substance on the basis of chemical composition.
Answer:

Question 10.
Classify the types of mixtures.
Answer:

Question 11.
Write a few examples for the following colloids.
Answer:

1. Gels – Hair cream, tooth paste
2. Foam – Soap bubbles, carbonated beverages.
3. Solid foam – Bread, Mattresses
4. Emulsion – Milk, butter, paints, facial cream, pesticides

Question 12.
Name the two phases in separation of the mixtures in chromatography.
Answer:

1. Mobile phase
2. Stationary phase

Question 13.
What is absorption? Give example.
Answer:
Absorption is the process in which the substance is dissolved throughout the bulk of another substance.
Eg: Paper soaks up or absorbs water.

Question 14.
What is adsorption? Give example.
Answer:
Adsorption is the process in which particles of a substances, adhere to a surface of another substance.
Eg: Charcoal adsorbs gases on its surface.

V. Answer the following in detail.

Question 1.
Explain the factors, which will affect the rate of evaporation, taking examples from our daily life experiences.
Answer:

1. Temperature: Warmer the evaporation surface, the higher the rate of evaporation. In ponds, lakes and rivers, the rate of evaporation is more in sunny days.
2. Surface area: The evaporation increase, with the increase of surface area. Eg: The water kept in a saucer evaporates faster than the water kept in a glass.
3. Humidity: The amount of water vapour is high during rainy season. The air can hold little water. So it slows down the evaporation. So we sweat and perspire.
4. Wind: The evaporation is slow at low wind. Evaporation is faster at high wind. The particles of water move away, along with the particles of air at high wind. So the wet clothes dry faster on a windy day.

Question 2.
Compare boiling and evaporation.
Answer:

S.No.	Boiling	Evaporation
1.	Vaporization process.	Natural process.
2.	Turns liquid into gas when it is heated.	The liquid changes into gas without heating.
3.	Fast process.	Slow process.
4.	Occurs only at boiling point.	Occurs at any temperature.
5.	It forms bubbles.	It does not form bubbles.
6.	Energy is required.	Energy is supplied by surrounding.
7.	Temperature of the liquid remains constant.	Temperature of liquid decreases.

Question 3.
Classify colloids based on physical state of dispersed phase and dispersion medium.
Answer:

S.No.	Dispersed Phase	Dispersion Medium	Name	Examples
1.	Solid	Solid	Solid Sol	Alloys, gems, coloured glass
2.	Solid	Liquid	•Sol	Paints, inks, eggs white
3.	Solid	Gas	Aerosol	Smoke, dust
4.	Liquid	Solid	Gel	Curd, Cheese, Jelly
5.	Liquid	Liquid	Emulsion	Milk, Butter, oil in water
6.	Liquid	Gas	Aerosol	Mist, fog, clouds
7.	Gas	Solid	Solid foam	Cake, bread
8.	Gas	Liquid	Foam ‘	Soap lather, Aerated water

Question 4.
Write the methods of separation for the following:
Answer:

• Separation of insoluble solids from liquids
  Filtration and Decantation
• The separation of fine and tiny particles of solid which do not settle at the bottom.
  Centrifugation
• Separation of soluble solids from liquids
  Evaporation and crystallization
• Separation of miscible liquids which do not differ much in their boiling points
  Fractional distillation
• Separation of two immiscible liquids
  Separating funnel
• Separation of different fractions of petroleum
  Fractional distillation with fractionating column
• Separation of mixture containing volatile and non-volatile solids.
  Sublimation.

Question 5.
Write the differences between mixture and compounds.
Answer:

S. No.	MIXTURE	COMPOUND	Name	Examples
1.	Mixture can be separated into its constituents by physical process.	Compounds can be separated into its constituents by chemical process.	Solid Sol	Alloys, gems, coloured glass
2.	Mixture shows the properties of its constituents.	The properties of a compound are entirely different from its constituent elements .	Sol	Paints, inks, eggs white
3.	Energy in the form of heat and light is neither given out nor absorbed in.	Energy in the form of heat and light is given out or absorbed.	Aerosol	Smoke, dust
4.	The composition or proportion of a mixture does not have a definite formula.	The composition of a compound is fixed. The constituents have a fixed ratio by mass.	Gel .	Curd, Cheese, Jelly
5.	A mixture does not have fixed boiling point or melting point.	A compound has a fixed boiling or melting point.	Emulsion	Milk, Butter, oil in water

Bio Zoo Circulatory System

Short Questions

Question 1: Why is circulatory system also known as transport system ?
Answer: Circulatory system is also called transport system because it transports food, water, hormones,
enzymes, electrolytes, antibodies and respiratory gases to or away from the body tissues.

Question 2: Write about origin and functions of Red Blood Corpuscles.
Answer: Origin: R.B.Cs. or erythrocytes are minute biconcave disc-like structures, flat in the centre and thick and round at periphery in blood formed in red bone marrow of the long bones and bregot bone.
Function: They help in the transportation of oxygen and carbon dioxide to the different parts of body.

Question 3: Complete the following table:

Components	Origin	Function	Approx. No. (mm3)	Life span
RBCs
WBCs
Platelets

Answer:

Components	Origin	Function	Approx. No. (mm3)	Life span
RBCs	Bone marrow	Carry O2 to the different parts of body	4.8 million-5.5 million	120 days
WBCs	Bone marrow	Develop immu­nity	7,000	Two weeks
Platelets	Large bone marrow cells	Initiate blood clotting	250,000	2-3 days

Question 4: Define the following terms Diapedesis.
Answer: The process in which the leucocytes or white blood cells squeeze out through the walls of blood capillaries at the site of injury to fight against pathogens.

Question 5: State any five functions of blood.
Answer: (i) It transports oxygen from lungs to body tissues.
(ii) It transports carbon dioxide from the tissues to the lungs partly in combination with haemoglobin and partly as solution in blood plasma.
(iii) It transports digested food to different organs of the body which is utilized by cells.
(iv) It helps in keeping the temperature of the body uniform by distributing heat.
(v) It forms a clot wherever there is a cut in a blood vessel. The clot not only prevents further loss of blood but also prevents the entry of disease germs.

Question 6: The table below is designed to indicate the transport of certain substances in our body. Fill in the blanks with suitable answers:

Answer: (i) Oxygen, (ii). Whole body, Lungs, (iii) Liver, Kidney
(iv) Liver, (v) Hormones, Endocrine glands, (vi) Tissues.

Question 7: Why are capillaries thin walled ?
Answer: The capillaries are thin walled, because they help in the exchange of gases and diffusion of materials into the cells. This diffusion is possible due to the thinness of its walls.

Question 8: Describe the role of lymph.
Answer: (i) Transport of nutrients and oxygen to the cells and tissues.
(ii) Removal of CO₂ and nitrogenous wastes from the tissues and carry them to the blood.
(iii) It absorbs fatty acids and glycerol through lacteals.
(iv) It destroys harmful pathogens by its lymphocytes.
(v) It maintains body temperature.
(vi) It regulates protein level in the tissue fluid.

Question 9: Name the blood vessels entering the heart and leaving the heart.
Answer: Blood Vessels entering the heart: The right atrium receives two large vessels :
(i) Anterior vena cava (ii) Posterior vena cava
Blood Vessels leaving the heart: Arising from the ventricle are two large blood vessels :
(i) The pulmonary artery (ii) The aorta
The coronary arteries arising from the base of aorta.

Question 10: Name the Blood vessels entering liver and kidney and Blood vessels leaving liver and kidney.
Answer: (a) Blood vessels entering liver:
(i) Hepatic artery (from aorta into liver).
(ii) Hepatic portal vein (from stomach and intestine into liver).
(b) Blood vessel entering kidney:
Renal artery (from aorta into kidney).
(c) Blood vessel leaving liver:
Hepatic vein (from liver into posterior vena cava)
(d) Blood vessel leaving kidney:
Renal vein (from kidney into posterior vena cava).

Question 11: What does the term ‘double circulation’ mean ?
Answer: Double circulation means that the blood flows twice in the heart before it completes one full round-the short pulmonary (lung) circulation and the long systemic (general body) circulation.
For this reason the blood circulation in human body is also called double circulation.

Question 12: In what ways does the blood entering the kidney differ from that leaving the kidney ?
Answer: The blood entering the kidneys contains excretory substances such as urea, uric acid, etc. These substances are removed from the blood in the kidneys and the blood is free from the waste : products of metabolism when it leaves the kidneys.

Question 13: What is blood pressure ? How is it measured ?
Answer: The blood flowing through the arteries exert some pressure on its walls. This pressure is known as blood pressure. It is measured by an instrument named as sphygmomanometer.

Question 14: What is the value of systolic B. P. and diastolic B. P. of a normal human adult ?
Answer: Systolic B. P. is 100-140.
Diastolic B. P. is 60-80.

Question 15: Write short note on Tissue Fluid.
Answer: Tissue Fluid or Intercellular Fluid: As the blood flows in the capillaries of the tissues, the plasma and the leucocytes Teak out’Through their walls. This fluid bathes the cells and is called the tissue fluid or the intercellular or extracellular fluid. It is from this fluid that the cells absorb oxygen and other required substances, and in turn, give out CO₂ and other wastes back into it.

Question 16: The table below is designed to indicate the major arteries emerging from the aorta and supplying blood to different organs.
Fill in the blanks with suitable answers.

Answer: (i) Renal, (ii) Gonads (testis, ovary), (iii) Right sub-Calvin,
(iv) Diaphragm, (v) Hepatic, (vi) Inter coastal.

Question 17: Describe in brief die cardiac cycle.
Answer: Cardiac Cycle : It is the sequential phenomenon of contraction and relaxation of heart. The action potential causes atria and then ventricles to undergo contraction (systole) followed by their relaxation (diastole). Systole forces blood to move from the atria to the ventricles and to the pulmonary artery and the aorta, then. The heart beats 72 times in a minute. So several cardiac cycles are done per minute. The duration of cardiac cycle is 0-8 seconds. Two heart sounds are heard by stethoscope during each cardiac cycle.

Question 18: When are the sounds ‘LUBB’ and ‘DUB’ produced during heart beat ?
Answer: The first sound ‘LUBB’ is produced when the atrio-ventricular valves get closed sharply at the start of ventricular systole. The second sound ‘DUB’ is produced at the beginning of ventricular diastole when the semilunar valves, at the roots of aorta and pulmonary artery get closed.

Question 19: What is the Rh-factor.
Answer: The Rh-factor was first discovered in the Rhesus monkey. It was found that Rh (rhesus) antigens were causing many of the transfusion failures that were unexplained by A-B-O system. There are at least eight different Rh antigens so far. The person bearing Rh-factor is Rh^+ve and person who does not possess this factor is Rh^-ve.

Give Reasons

Question 1: Why is circulatory system also known as transport system ?
Answer: The circulatory system is also known as transport system because it carries various substances from one organ to another.

Question 2: Why do people have a common belief that the heart is located on the left side of the chest ?
Answer: The narrow end of the roughly triangular heart is pointed to the left side and during working the contraction of the heart is most powerful at this end giving a feeling of the heart being on the left side. Actually it is right in the centre between the two lungs and above the diaphragm.

Question 3: Veins have valves at intervals in their inner lining whereas the arteries do not have valves. Explain.
Answer: In arteries blood flows with pressure but in veins the pressure falls considerably and the back flow of blood is prevented by the semilunar valves.

Question 4: Why is SA node called pace maker of the heart.
Answer: The SA node is called the pace-maker of the heart because the wave of contraction which conducts heart beat originates in it.

Question 5: Why is it necessary to know the blood groups before giving transfusion of blood ?
Answer: In blood transfusion, it is necessary that the kind or the type of blood to be transfused should be matched with the type of blood of the receiving person. Otherwise, the RBC of the donor blood will stick to each other and block the passage of blood vessels of the receiver leading to death. Hence, it is necessary to know the blood groups before transfusion of blood.

Question 6: Can the blood dot inside the blood vessels. Give reason in support of your answer.
Answer: The blood inside the blood vessels does not dot because there is no free thromboplastin available to convert into active prothrombin into active thrombin.

Question 7: Why does the number of leucocytes increase during infection ?
Answer: The number of leucocytes increase during infection to fulfill the defence demand of the body.

Differentiate

Question 1: Blood and Lymph.
Answer:

Blood	Lymph
(i) Blood contains plasma, RBCs, WBCs and platelets.	Lymph contains only the soluble parts of plasma.
(ii) It contains albumin, globulin and fibrinogen.	It does not contain these substances.
(iii) It is a opaque red coloured fluid of alkaline reaction.	It is a colourless fluid resembling blood in other respects.

Question 2: Arteries and Veins.
Answer:

Arteries	Veins
(i) These carry blood from the heart to different organs of the body.	These collect blood from different organs of the body.
(ii) These contain oxygenated blood (Pulmonary artery contains deoxygenated blood)	These contain deoxygenated blood. (Pulmonary vein contains oxygenated bloods).
(iii) Blood flows rapidly with jerks under pressure.	Blood flows slowly at a constant slow speed.
(iv) The walls are thick and elastic.	The walls are thin and non-elastic.
(v) Valves are absent.	Valves are present.

Question 3: Red blood cells and White blood cells.
Answer:

RBCs	WBCs
(i) These are minute biconcave disc like structures, flat in centre, thick and round at the periphery and nuclei are absent in mature RBCs.	These are amoeboid and can produce pseudopodia and have a nucleus.
(ii) These contain a respiratory pigment haemoglobin.	Haemoglobin is not present.
(iii) RBCs help in transport of oxygen and CO2.	WBCs help in protection of the body against infections from the germs.
(iv) The number of RBCs in adult male is 5 million per cu. millimeter.	Their number is usually about 4000-8000 per cubic millimeter.
(vi) Their average life span is about 120 days.	Their average life span is about two weeks.

Question 4: Open circulatory system and Closed circulatory system.
Answer:

Open circulatory system	Closed circulatory system
(i) Blood may flow in vessels but also remains in direct contact with tissues.	Blood flows in definite vessels known as arteries and veins.
(ii) Blood spaces or sinuses are present.	Blood spaces or sinuses are absent.
(iii) Haemocoel is present.	Haemocoel is absent.
(iv) Found in insects, e.g., cockroach, housefly, etc.	Found in annelids and higher vertebrates.

Question 5: Diastole and Systole.
Answer:

Diastole	Systole
It is the condition of the heart when the chambers relax.	It is the condition of the heart when the chambers of the heart contract.
It is the condition when the blood enters the chamber, e,g., when left atrium relaxes, blood enters from the pulmonary vein under low pressure.	It is the condition when the blood is pumped out of the heart, e.g., when the left ventricle contracts, the blood is pumped to the body under high pressure.

Question 6: Blood plasma and Serum.
Answer:

Blood plasma	Serum
It is transparent fluid part of blood that contains blood corpuscles, fibrinogen and prothrombin.	It is a transparent fluid secreted from blood clot that do no contain blood corpuscles, fibrinogen and prothrombin.

Diagram Based Questions

Question 1: Given alongside is a diagram of the external features of the heart.
(i) Name the parts ‘1’ to ‘7’.
(ii) What happens if the coronary artery gets an internal clot ?
(iii) Which type of blood does part ‘5’ carry ?
(iv) Mention one structural difference between part ‘5’ and ‘4’.
Answer: (i) 1. Aorta, 2. Left atrium, 3. Left ventricle, 4. Dorsal aorta, 5. Inferior vena cava, 6.Superior vena cava, 7. Pulmonary artery.
(ii) If the coronary artery gets an internal clot, the corresponding part of the heart does not get its blood supply. This will result in loss of contraction or even death of the cardiac cells resulting in a heart attack or coronary arrest which may prove to be fatal.
(iii) Part ‘5’ which is the inferior vena cava carries deoxygenated blood which is rich in CO₂ and metabolic wastes.
(iv) Part ‘5’ is more muscular and lumen is narrow while part ‘4’ is less muscular and lumen is wider.

Question 2: Given below is the simplified pathway of the circulatory system :
(i) Name the blood vessels marked 1 to 8.
(ii) Name the chamber of the heart which:
(a) Receives blood from ‘1’.
(b) Pumps blood into blood vessel ‘8’.
(iii) Mention two structural differences between blood vessels ‘7’ and ‘2’.
Answer: (i) 1. Pulmonary vein, 2. Dorsal aorta, 3. Hepatic portal vein, 4. Renal artery, 5. Iliac vein, 6. Hepatic vein, 7. Inferior vena-cava, 8. Pulmonary artery.
(ii) (a) Left auricle.
(b) Right ventricle.
(iii) (a) The inferior vena cava arises from iliac veins coming from the hind limbs, while the dorsal aorta arises from the left ventricle and continues behind as the abdominal aorta.
(b) The deoxygenated blood is collected by the inferior vena cava, while the branches of the dorsal aorta supplies oxygenated blood to the body parts.

Question 3: Given below is a schematic representation of the circulatory system in man. Study the same and answer the questions that follow:
(i) Label the parts 1 to 4 indicated in the diagram.
(ii) Give one difference between the parts 1 and 2 based on:
(a) their structure
(b) the nature of blood flowing through them.
(iii) What is the specific name of the type of blood circulation that takes place between the heart and the lungs ?
(iv) Name the valve found at the beginning of the part labeled 3.
Answer: (i) 1. Right auricle
2. Left ventricle
3. Aorta
4. Body organs
(ii)

Right Auricle	Left Ventricle
The wall of right auricle is thinner and smooth.	The wall of left ventricle is thicker and rough.
The deoxygenated blood flows.	The oxygenated blood flows.

(iii) Pulmonary circulation.
(iv) Aortic semilunar valve.

Question 4: Given alongside is a highly diagrammatic sketch of the internal structure of the human heart: (i) Name the parts numbered 1-11. (ii) What is the main difference in the quality of blood contained in parts 6 and 7 ?
Answer: (i) 1. Anterior or superior vena cava
2. Pulmonary vein.
3. Mitral or bicuspid valve.
4. Dorsal aorta.
5. Semilurlar aortic valve.
6. Left ventricle.
7. Right ventricle
8. Pulmonary semilunar valve.
9. Pulmonary artery.
10. Tricuspid valve.
11. Right atrium.
(ii) Part 6 contains oxygenated blood whereas part 7 contains deoxygenated blood.

Question 5: The diagram below represents the simplified pathway of the circulation of blood. Study the same and answer the questions that follow:
(i) Name the blood vessels labeled 1 and 2.
(ii) State the function of blood vessels labeled 5 and 8.
(iii) What is the importance of the blood vessel labeled 6 ?
(iv) Which blood vessel will contain a high amount of glucose and amino acids after a meal ?
(v) Draw a diagram of the different blood cells as seen in a smear of human blood.
Answer: (i) (1) Anterior vena cava.
(2) Aorta
(ii) (5) Carries oxygenated blood to the liver.
(8) Brings deoxygenated blood from lower parts of the body to heart.
(iii) It brings all the digested food and deoxygenated blood from parts of alimentary canal to liver.
(iv) Blood vessel number 6.
(v)

Question 6: The figures given below are cross-sections of blood vessels.
(i) Identify the blood vessels A, B and C.
(ii) Name the parts labeled 1-4.
(iii) Mention two structural differences between A and B.
(iv) Name the type of blood A that flows (a) through A, (b) through B.
(v) In which of the above vessels referred to in (iv) above does exchange of gases actually take place ?
Answer: (i) (A) Artery, (B) Vein, (C) Capillary.
(ii) 1. Connective tissue
2. Lumen.
3. Tunica media.
4. Tunica intima/Endothelium.
(iii) Two structural differences between arteries and veins are :
(a) Arteries are thick-walled and veins are thin walled.
(b) There are no valves in arteries while valves are present in veins.
(iv) (a) Oxygenated blood flows through A.
(b) Deoxygenated blood flows through B.
(v) The exchange of gases takes place in C capillaries.

Question 7: Given below is a simple diagram of the circulation of blood in a mammal showing the main blood vessels, the heart, lungs and body tissues. The blood vessel labeled 6 contains deoxygenated blood and 2 the valve leading to it has three semi-lunar pockets.
(i) Name the blood vessels of organs marked by number 1 to 8.
(ii) What do you mean by the term ‘double circulation’ of blood in mammals ?
(iii) What is diastole ?
Answer: (i) 1. Veins from tissues.
2. Superior vena cava
3. Aorta
4. Right ventricle
5. Left ventricle
6. Pulmonary Artery
7. Pulmonary vein
8. Lungs.
(ii) The heart is said to have double circulation because the blood passes through the heart twice.
(a) It first leaves t.rough the right ventricle, goes to the lungs and then returns to the left auricle of heart (pulmonary circulation).
(b) It leaves through the leftyentricle, circulates through the body, and again returns to the right auricle of heart (systemic circulation).
(iii) Diastole is the phase of relaxation of the heart muscles during which the heart chambers fill with blood and the supply of blood to the cardiac muscle is improved.

Question 8: The diagram given below represents the human heart in one phase of its activity. Study the same and then answer the questions that follow:
(i) Name the phase.
(ii) Which parts of the heart are contracting in this phase ? Give a reason to support your answer.
(iii) Name the part numbered 1 to 6.
(iv) What type of blood flows through the parts marked ‘1’ and ‘2’?
(v) How many valves are closed in this phase?
Answer: (i) Ventricular systole.
(ii) Both ventricles are contracting in this phase, because both bicuspid and tricuspid valves are closed in order to prevent the back flow of blood into auricles and the semilunar valves are open.
(iii) 1. Pulmonary artery,
2. Aorta,
3. Pulmonary vein,
4. Left auricle,
5. Bicuspid valve (mitral valve),
6. Right ventricle.
(iv) ‘1’—carnes deoxygenated blood. ‘2’—carries oxygenated blood.
(v) Two (Bicuspid and Tricuspid) valves.

Question 9: The figure below represents die internal structure of a mammalian heart and the associated blood vessels.
(i) (a) Name each of the structures labeled 1, 2, 3, 4, 5, 6, 7 and 8.
(b) State the function of each of the structures 5, 6, 7 and 8.
(ii) (a) State the function of heart as an entire organ.
(b) Why are the walls of the left ventricle more muscular than the right ?
Answer: (i) (a) 1. Right auricle,
2. Left ventricle,
3. Pulmonary artery,
4. Pulmonary vein,
5. Inferior vena cava,
6. Aorta,
7. Pulmonary semilunar valve,
8. Tricuspid valve.
(b) 5 — carry deoxygenated blood from the body parts to the right auricle of the heart.
6 — distributes blood all over the body.
7 — prevents the back flow of the blood into the ventricles.
8 — prevents the reverse flow of the blood from right ventricle into the right auricle,
(ii) (a) The heart makes the blood to circulate all over the body.
(b) The walls of left ventricle are more muscular because they have to pump blood to a larger distance than the right so that walls have to withstand a high pressure.

Question 10: The diagrams given below show the cross section of two kinds of blood vessels:
(i) Identify the blood vessels A and B. In each case give a reason to support your answer.
(ii) Name the parts numbered 1 and 2.
(iii) When are the sounds “LUBB” and “DUB” produced during a heartbeat ?
(iv) Name the blood vessel that
(a) begins and ends in capillaries.
(b) supplies blood to the walls of the heart.
Answer: (i) A—Artery, B—Vein, because in A lumen is narrow, in B lumen is wide.
(ii) 1 —> Endothelium, 2 —> Lumen.
(iii) Lubb is produced when ventricles contract and atrio-ventricular valves get closed at the beginning of ventricular systole.
Dub is produced by the closure of semilunar valves at the beginning of ventricular diastole.
(iv) (a) Portal system
(b) Coronary arteries

Question 11: The diagram given below represents the human heart in one phase of its functional activities. Study the same and answer the questions that follow:
(i) Name the phase.
(ii) Label the parts 1, 2 and 3
(iii) Which part of the heart is contracting in this phase ? Give a reason to support your answer.
Answer: (i) Atrial systole.
(ii) (1) Left pulmonary artery
(2) Superior vena cava
(3) Aorta.
(iii) Simultaneous contraction of both the auricles. Because the cuspid valves are open, allowing blood to flow into ventricles.

Question 12: The diagram shows different types of blood cells, Name them.
Answer: (A) Red blood cells (B) RBC in section (C) Basophil (D) Neutrophil (E) Lymphocyte (F) Monocyte (G) Eosinophil (H) Platelets.

Question 13: The diagram below represents a certain category of blood vessels showing the role of a special structure in their walls :
(i) Name the kind of blood vessels shown.
(ii) What is the structure shown inside the blood vessels ?
(iii) What is the role of these structures ?
(iv) Are these structures present in any other kind of blood vessel ? If so, name it.
(v) Towards which side of the figure (Top or Bottom) is the heart located ?
Answer: (i) Veins.
(ii) Pocket valves.
(iii) These structures maintain the flow of blood in one direction only by preventing its back¬flow.
(iv) Yes. These are present in lymph vessels.
(v) The heart is located towards the top side of the figure.

Question 14: The diagram represents the ‘closed system’ or ‘double circulation’ of blood in mammals.
Justify the above statement.
State two structural and two functional differences between the arteries and veins.
State the changes in the composition of blood as it passes through the following organs :
(a) Lungs (b) Gut (c) Liver (d) Kidneys.
Answer: Double circulation or closed system : In human beings, the heart has double circulation as the blood passes through the heart twice.
(1) It first leaves the heart (right ventricle) and goes to lungs and then returns to the heart (left auricle).
(2) From the left auricle it circulates through the entire body and again returns to the heart (right auricle).
See Answer to Question 11, differentiate between.
(a) In lungs, the blood releases carbon dioxide and picks up oxygen.
Hence before passing through the lungs it contains more CO₂ while it contains more oxygen after it has passed through the lungs.
(b) When blood passes through the gut, it absorbs digested food materials i.e., it contain more carbohydrates, proteins, fats, water, ions and vitamins.
(c) As the blood passes through liver, it contains more urea another waste materials.
(d) As the blood passes through kidneys, it contains less urea and other waste materials.

Sketch and Label the Diagram

Question 1: Draw the diagrams external features of heart.
Answer:
Question 2: Position of valves in human heart.
Answer:
Question 3: Draw well labeled diagrams of part Artery and Superior vena cava to show the structural.
Answer: (i) Artery
(ii) Superior vena cava

Explain the Terms

Question:
1. Blood Pressure
2. Pulse rate
3. Double Circulation
4. Hepatic Portal System
5. Diapedesis
6. Haemopoiesis
7. Phagocytosis
8. Electrocardiogram (ECG)
9. Pace maker
Answer: 1. When the blood flows in the artery it exerts a pressure on the elastic wall of the artery which is called blood pressure. It is greater during systole (contraction) than during diastole (relaxation) of the heart. In a normal adult the blood pressure is 120/80 where systolic is 120 and diastolic pressure is 80 mm of Hg (mercury).
2. Pulse rate indicates the rate at which the heart beats. Each heartbeat results from the contraction (systole) and relaxation (diastole) of the heart. Both the auricles contract at a time and pour the blood into the main artery (dorsal aorta). The systole and diastole take 0.8 secs., which is 75 beats per minute.
3. In mammals the heart produces two separate circulations, the pulmonary to the lungs and systemic to the rest of the body. These two separate circulations are jointly called double circulation. From the right ventricle deoxygenated blood goes to lung for purification and
comes back to left auricle through pulmonary vein after purification which is known as pulmonary circulation,. Distribution of blood from left ventricle to different parts of the body and back to hearts as deoxygenated blood is known as systemic circulation.
4. Systems of veins carrying blood capillaries of intestine to liver in mammals is called hepatic portal system. The blood from the intestine carries digested carbohydrates and proteins, i.e., glucose and amino acids to the liver which converts them into glycogen and urea respectively.
5. The passage of White Blood Corpuscles through unruptured wall of blood vessels is known as diapedesis. It also helps in engulfing the germs and also protects the body from getting infected.
6. Formation of blood corpuscles like WBC and RBC by the bone marrow and lymph nodes is called haemopoiesis. Bone marrow and lymph nodes are called haemopoietic tissues.
7. When WBC engulfs the damaged tissues bacteria and germs, the phenomenon is called phagocytosis.
8. Electrocardiogram is the recorded report of an electrocardiograph which is produced by the heart muscle during the cardiac cycle of contraction and relaxation.
9. The tissue present on the wall of the right auricle where initiation of heart beat starts is known as a pace maker.

Name the Following

Question:
1. The study of blood vascular system including arteries, veins and heart.
2. Number of chambers present in the human heart.
3. Name the muscles which made up the wall of the heart.
4. Layer, which surrounds the heart.
5. The blood vessel leaving the left ventricle of the mammalian heart.
6. The valve present between the left atrium and the left ventricle.
7. The blood vessel supplying blood to the kidney.
8. The blood vessel that begins and ends in capillaries.
9. The blood vessels which have valves in them.
10. The fine blood vessels in the tissues through which exchange of materials occurs
11. The number of RBCs in men.
12. The instrument by which RBC are counted is called.
13. Oxygen is transported by the blood in the form of
14. The enzyme which converts fibrinogen to fibrin.
15. The blood plasma from which fibrinogen has been removed.
16. By which the human body is protected from invading bacteria.
Answer:
1. Angiology
2. Four
3. Cardiac muscles
4. Pericardium
5. Dorsal aorta
6. Bicuspid valve
7. Renal artery
8. Hepatic portal vein
9. Veins
10. Capillaries
11. 5,000,000/mm³
12. Haemocytometer
13. Oxyhaemoglobin
14. Thrombokinase
15. Serum
16. W.B.C

Give Technical Terms

Question:
1. What is the approximate weight of heart of a man ?
2. An unstable bright red compound formed between haemoglobin and oxygen to carry the oxygen to the body cells.
3. An artery which carries de-oxygenated blood.
4. Name the vein in the human body which carries oxygenated blood.
5. Name the metallic element present in red blood cells.
6. A fluid that transports fatty acids and glycerols.
7. The phase of cardiac cycle in which the auricles contract.
8. The respiratory pigment contained in human blood.
9. The blood vessel that supplies oxygenated blood to the liver.
10. Name an instrument which is used to hear heart sounds.
11. The mineral element essential for the clotting of blood.
12. The soluble protein present in blood plasma responsible for blood clotting.
13. The process by which leucocytes engulf and destroy bacteria.
14. WBCs squeeze through the walls of the capillaries into the tissue.
15. The artificial method of filtering the blood or removing the wastes from the blood.
Answer:
1. 300 gm (approx.)
2. Oxyhaemoglobin
3. Pulmonary artery
4. Pulmonary vein
5. Iron 6. Lymph
7. Atrial systole
8. Haemoglobin
9. Hepatic artery
10. Stethoscope
11. Calcium
12. Prothrombin
13. Phagocytosis
14. Diapedesis
15. Dialysis

Fill in the Blanks

Complete the following sentences with appropriate words :
1. The iron pigment Haemoglobin gives red colour to the blood.
2. The Heart is the most powerful organ in the circulatory system.
3. The average heartbeat rate is 72 beats per minute in human being.
4. In man (human), heart has Four chambers.
5. The erythrocytes contain an iron-rich pigment called Haemoglobin.
6. Non-coagulation of blood is called Haemophilia.
7. When oxygen is in fairly high concentration, the haemoglobin quickly combines with it and forms an unstable compound known as Oxyhaemoglobin.
8. The element required for blood clotting is Calcium.
9. Thrombocyte helps in blood clotting.
10. The three distinct types of blood vessels are Arteries, veins and the capillaries.
11. The site of production of W.B.Cs in the embryo is Red bone marrow.
12. The Spleen is referred to as the graveyard of red blood corpuscles and the bone marrow referred to as the cradle of red blood corpuscles.
13. The red blood corpuscles are Biconcave and disc shaped cells without nucleus.
14. The fluid in the space between the tissue cell is called Tissue fluid/interstitial fluid.
15. The foundations of physiology were laid by the physician William Harvey.
16. Beside food, oxygen and waste materials, circulatory system transports Hormones to various parts of the body.
17. Arteries are the blood vessels which usually carry oxygenated blood.
18. The chamber of heart which pumps blood into aorta is Left ventricle.
19. Arteries are Thick walled and the veins are thin walled vessels.
20. The blood vessel which transports blood from heart to an organ is called Artery.
21. The sequence of one systole followed by one diastole is termed as the Cardiac cycle.
22. The membranous covering of the heart is Pericardium.
23. The heart is made up of special muscles, the Cardiac muscles.
24. The blood vessel that begins and ends in capillaries is the Portal vein.
25. The blood vessel leaving the left ventricle of the mammalian heart is the Left aorta.

True & False

Mention, if the following statements are True or False. If false rewrite the wrong statement in its correct form:
1. The heart of a normal human adult beats more than one lakh times per day. (True)
2. W.B.C. contains haemoglobin. (False, RBC contains haemoglobin.)
3. R.B.Cs are of several kinds whereas WBCs are of one kind. (False, RBCs are of one kind whereas WBCs are of several kinds.)
4. Leucocytes show amoeboid movement. (True)
5. The average life of red blood cells in our body is about 120 hours. (False, The average life of a red blood cell in our body is about 120 days.)
6. Serum is an immunological preparation of blood (without cells and fibrinogen) containing antibodies and antitoxins against specific diseases. (True)
7. Blood group AB is universal donor. (False, Blood group O is a universal donor.)
8. The walls of auricles are thicker than those of ventricles. (False, The walls of auricles are thinner than those of ventricles.)

State the Location

Name	Location
Hepatic portal vein	It is located between alimentary canal and liver.
Tonsils	They are located in the posterior wall of nasopharynx.
Spleen	It is located just beneath the stomach.
Sino-auricular node	It is a special kind of muscle located in the heart.
Bicuspid value	It is located in between the left auricle (atrium) and left ventricle left auricle.
Pulmonary vein	Arises from lungs and pours blood into the left auricle.
Semilunar valves of the heart	Located in the arteries leaving the heart.
Bundle of His	Arises from atrio ventricular node, moves along inter-ventricular septum to the apex of ventricle and then radiates upwards.

State the Function

Write the functional activity of the following structures:

Name	Function
Pulmonary vein	Brings oxygenated blood from lungs to the heart for circulation throughout the body.
Thrombocytes	Helps in clotting of blood.
Semilunar valves of the heart.	They preyent the back flow of blood from the pulmonary artery and aorta into the heart.
Bundle of His	They carry the wave of excitation from atrio ventricular node to the.ventricles.
Coronary artery	It carries blood to the muscles of heart..
Bicuspid valve	It prevents the reverse flow of blood from the left ventricle into the left auricle.
Haemoglobin	It is the respiratory pigment, helps to carry O2 to the body parts.
Vitamin K	Helps in clotting of blood.
Pericardium	It protects the heart.
Pulmonary artery	To Transports deoxygenated blood to the lungs.
Lymph	It transports fatty acids and glycerol, it also protects the body against microorganisms.
W.B.C.	To fight against micro organism by producing antibodies.
R.B.C.	To transports oxygen to the body parts.
Platelets	Helps in bloods clotting.
Tricuspid valve	It prevents the reverse flow of blood from the right ventricle into the left auricle.
Chordae tendinae	To keep the cuspid valves in position.
Vena cava	To carry deoxygenated blood from the body parts to the right auricle of the heart.

Choose the Odd One Out

1. Human heart, Fish heart, Reptile heart, Toad heart. (Heart Fish)
2. Artery, Vein, Portal vein, Lacteal. (Lacteal)
3. RBC, ATP, WBC, Platelets. (ATP)
4. Purkinje fibres, A. V. node, A. V. valve, S. A. node. (A.V. Values)
5. Mitral valve, Tricuspid valve, Semilunar valve, Venous valve. (Venous Value)
6. Systolic pressure, Diastolic pressure, Stethoscope, Sphygmomanometer. (Stethescope)

Multiple Choice Questions

1. The function of WBC is:
(a) To distribute heat (b) To protect enzymes
(c) To cause blood clotting (d) To destroy bacteria

3. The chief function of lymph nodes in mammaJs is to:
(a) Produce WBC’s (b) Produce hormones
(c) Destroy old RBC’s (d) Destroy pathogens

2. Agranulocytes are:
(a) Lymphocytes, monocytes (b) Lymphocytes, basophils
(c) Eosinophils, basophils (d) Eosinophils, monocytes

4 What will happen if the spleen of a man is removed?
(a) W.B.C. production will be lowered
(b) Removal of dead RBC will not take place
(c) Antibody production will be decreased
(d) R.B.C. production will be stopped

5. Which protein is used in preventing dotting of blood?
(a) Albumin (b) Heparin
(c) Fibrinogeri (d) Globulin

6. The beating of the heart of man is hearl on the left side, because:
(a) The left ventride is towards the left side
(b) Both the ventricles are towards the left side
(c) Contraction of heart is powerful on left side.
(d) The dorsal aorta is on the left side

7. Arteries are:
(a) Thin walled and blood flows under diminished pressure
(b) Thick walled and blood flows under high pressure
(c) Thin walled and blood flows under low pressure
(d) Thick walled and blood flows under diminished pressure

8. What is blood pressure?
(a) The pressure of blood on the heart muscles
(b) The pressure of blood exerted on the walls of arteries and veins
(c) The pressure of blood on the walls of veins only
(d) The pressure of blood on the walls of arteries only

9. Erythroblastosis foetalis can occur when:
(a) Man Rh^+ve and woman Rh^+ve (b) Man Rh^+ve and woman Rh^+ve
(c) Man Rh^+ve and woman Rh^+ve (d) Man Rh^+ve and woman Rh^+ve

10. Blood pressure is measured by:
(a) Electrocardiogram (ECG) (b) Stethoscope
(c) Sphygmomanometer (d) Pulse rate

Match the Column

Column ‘II’ is a list of items related to ideas in Column ‘I’. Match the term in Column ‘II’ with the suitable idea given in Column ‘I’.

Column I	Column II
(i) Superior vena cava	(a) Collect deoxygenated blood from the wall of the heart.
(ii) Inferior vena cava	(b) Carry oxygenated blood to heart muscle.
(iii) Pulmonary vein	(c) Collects deoxygenated blood from upper part.
(iv) Coronary veins	(d) Collects deoxygenated blood from lower parts.
(v) Coronary artery	(e) Brings oxygenated blood from lungs.
(vi) Aorta	(f) Large artery
(vii) Heart attack	(g) Large vein
(viii) Blood Pressure	(h) Oxygenated blood
(ix) Tricuspid valve	(i) Sphygmomanometer
(x) Bicuspid valve	(j) Allows blood flow from right auricle to right ventricle.
(xi) Contraction and relaxation of heart	(k) Blocking of coronary arteries.
	(l) Cardiac muscle.
	(m) Allows blood flow from left auricle to left ventricle.
	(n) Allows blood flow from right ventricle of pulmonary aorta.

Answer: (i) (c) (ii) (d) (iii) (e) (iv) (a) (v) (b) (vi) (c) (vii) (c) (viii) (a) (ix) (b) (x) (e) (xi) (d)