NCERT Grade 7-Respiration in Organisms-Questions

NCERT Solutions for Class 7 Science

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Respiration in Organisms

1.    Why does an athlete breathe faster and deeper than usual after finishing the race?

2.    List the similarities and differences between aerobic and anaerobic respiration.

3.    Why do we often sneeze when we inhale a lot of dust-laden air?

4.    Take three test-tubes. Fill 3/4th of each with water. Lebel them A, B and C. Keep a snail in the test-tube would have the highest concentration of CO2?

5.    Tick the correct answer:

(a) In cockroaches, air enters the body through

(i) lungs                        (ii) gills

(ii) spiracles                (iv) skin

(b) During heavy exercise, we get cramps in the legs due to the accumulation of

(i) Carbon dioxide     (ii) Lactic acid

(iii) Alcohol                 (iv) water

(c) Normal range of breathing rate per minute in an average adult person at rest is:

(i) 9-12                         (ii) 15-18

(iii) 21-24                    (iv) 30-33

(d) During exhalation, the ribs:

(i) Move outwards          (ii) Move downwards

(iii) Move upwards         (iv) do not move at all.

6.    Match the items in Column I with those in Column II

Column I                   Column II

(a) Yeast                  (i) Earthworm

(b) Diaphragm       (ii) Gills

(c) Skin                    (iii) Alcohol

(d) Leaves               (iv) Chest cavity

(e) Fish                   (v) Stomata

(f) Frog                    (vi) Tracheae


7.    Mark “T” if the statement is true and ‘F’ if it is false:

(i) During heavy exercise the breathing rate of person slows down. (T/F)

(ii) Plants carry out photosynthesis only during the day and respiration only at night. (T/F)

(iii) Frogs breathe through their skins as well as their lungs. (T/F)

(iv) The fishes have lugs for respiration. (T/F)

(v) The size of the chest cavity increases during inhalation.

8.    Given below is a square of letters in which are hidden different words related to respiration in organisms. These words may be present in any direction-upwards, downwards, or along the diagonals. Find the words for your respiratory system.

Clues about these words are given below the square.

(i) The air tubes of insects.

(ii) Skeletal structure surrounding chest cavity.

(iii) Muscular floor of chest cavity.

(iv) Tiny pores on the surface of leaf.

(v) Small opening on the sides of the body of an insect.

(vi) The respiratory organ of human beings.

(vii) The opening through which we inhale.

(viii) An anaerobic organism.

9.  The mountaineers carry oxygen with them because ————-.

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