MCQ Questions for Class 7 Science Chapter 10 Respiration in Organisms with Answers

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All questions answers in the last paragraph

Q1. A person can hold air in the lungs is:

(A) 50 ml
(B) 5000 ml
(C) 500 ml
(D) 0.5 ml

Q2. Name the organ of the body in which the blood is oxygenated.

(A) Heart
(B) Lungs
(C) Lever
(D) Pancreas

Q3. What is the function of the hair in the nose?

(A) To secrete mucus.
(B) To trap dust particles.
(C) To protect the mucus glands.
(D) To prevent germs from entering the lungs.

Q4. An example of aerobes is

(A) cat
(B) dog
(C) human being
(D) all of these

Q5. We feel hungry after a physical activity because we need:

(A) oxygen
(B) energy
(C) food
(D) none of these

Q6. All organisms are made of small microscopic units which cannot be seen with the naked eyes, called

(A) animals
(B) cells
(C) tissues
(D) organs

Q7. Chest cavity is surrounded by

(A) 12 pair of ribs
(B) 10 pair of ribs
(C) 11 pair of ribs
(D) 25 ribs

Q8. Sometimes when we do heavy exercise, anaerobic respiration takes place in our muscle cells. What is produced during this process?

(A) alcohol and lactic acid
(B) alcohol and CO2
(C) lactic acid and CO2
(D) lactic acid only

Q9. A film of moisture of appears on the surface of the mirror when we:

(A) inhale
(B) exhale
(C) breathe
(D) none of these

Q10. Organisms get energy through

(A) food
(B) eating
(C) sleeping
(D) none of these

Q11. Which are the gases involved in breathing?

(A) O2 and NO2
(B) O2 and SO2
(C) O2 and O3
(D) O2 and CO2

Q12. Lime water turns milky due to the presence of which of the following gases?

(A) Carbon monoxide
(B) Carbon dioxide
(C) Nitrogen
(D) Oxygen

Q13. The process of breakdown of food in the cell is known as

(A) breakdown process
(B) cellular respiration
(C) food breakdown
(D) none of these

Q14. The mountaineers carry oxygen with them because:

(A) At an atitude of more than 5 km there is no air
(B) The amount of air available to a person is less than that available on the ground
(C) The temperature of air is higher than that on the ground
(D) The pressure of air is higher than that on the ground

Q15. During the process of exhalation, the ribs move

(A) down and inwards
(B) up and inwards
(C) down and outwards
(D) up and outward

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