Ch – 6 Life Processes (Part 2)

Answer the following:

Q.1: During breathing cycle, the lungs always contain a ________________ of air.

Ans: residual volume

Q.2: The walls of alveoli contain an extensive network of _______________.

Ans: blood vessels

Q.3: Why is carbon dioxide mostly transported in dissolved form in our blood ?

Ans: Because it is more soluble in water than oxygen

Q.4: __________ transports food, carbon dioxide and nitrogenous wastes in the dissolved form.

Ans: Plasma

Q.5: Oxygen from the lungs come to the thin walled upper chamber of the heart – _______________.

Ans: Left atrium

Q.6: ___________ ensure that the blood does not flow backwards when the atria or ventricles contract.

Ans: valve

Q.7: Which animals have three-chambered hearts ?

Ans: amphibians and reptiles

Q.8: What is blood pressure ?

Ans: The force that blood exerts against the wall of a vessel is called blood pressure.

Q.9: What is systolic pressure ?

Ans: The pressure of blood inside the artery during ventricular systole (contraction) is known as systolic pressure. Normal systolic pressure is 120 mm of Hg.

Q.10: What is diastolic pressure ?

Ans: The pressure of blood inside the artery during ventricular diastole (relaxation) is diastolic pressure. Normal diastolic pressure is 80 mm of Hg.

Q.11: Blood pressure is measured with an instrument called ______________.

Ans: sphygmomanometer

Q.12: What causes high blood pressure (hypertension) ?

Ans: It is caused due to the constriction of arterioles, which results in increased resistance to blood flow.

Q.13: ___________ are the vessels that carry blood from the heart to various organs of the body.

Ans: arteries

Q.14: _____________ collect blood from different organs and bring it back to the heart.

Ans: veins

Q.15: The smallest vessels which have one-cell thick walls are known as ______________.

Ans: capillaries

Q.16: ______________ carries digested and absorbed fat from intestine and drains excess fluid from extra cellular space back into the blood.

Ans: Lymph

Q.17: _____________ transports the products of photosynthesis from the leaves to the other parts of the plant.

Ans: phloem

Q.18: What is transpiration ?

Ans: The loss of water in the form of vapour from the aerial parts of the plant is known as transpiration.

Q.19: The transport of soluble products of photosynthesis is known as __________________.

Ans: translocation

Q.20: Each kidney has large number of filtration units called _____________.

Ans: nephrons

Q.21: Urine is stored in the _________________.

Ans: urinary bladder

Q.22: Daily, The initial filtrate in kidneys in a healthy body is _______.

Ans: 180 L

Published by Priya Prakash

In the midst of winter, i found there was within me an invincible summer ~ Albert Camus

3 thoughts on “Ch – 6 Life Processes (Part 2)

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