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NCERT solutions Science Class 7 chapter 10 Respiration in Organisms

Chapters

NCERT Science Class 7

Science Textbook for Class  7

Chapter 10 - Respiration in Organisms

Pages 118 - 119

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

Q 1 | Page 118

List the similarities and differences between aerobic and anaerobic respiration.

Q 2 | Page 118

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

Q 3 | Page 118

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

Q 4 | Page 118

Tick the correct answer:

In cockroaches, air enters the body through

1) lungs

2) gills

3) spiracles

4) skin

Q 5.1 | Page 118

Tick the correct answer:

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

1) carbon dioxide

2) lactic acid

3) alcohol

4) water

Q 5.2 | Page 118

Tick the correct answer:

Normal range of breathing rate per minute in an average adult person at rest is

1) 9 – 12

2) 15 – 18

3) 21 – 24

4) 30 – 33

Q 5.3 | Page 118

Tick the correct answer:

During exhalation, the ribs

1) move outwards

2) move downwards

3) move upwards

4) do not move at all

Q 5.4 | Page 118

Match the items in Column I with those in Column II:

Column I Column II
Yeast Earthworm
Diaphragm Gills
Skin Alcohol
Leaves Chest cavity
Fish Stomata
Frog Lungs and skin
  Tracheae
Q 6 | Page 118

Mark T if the statement is true and F if it is false:

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

Q 7.1 | Page 119

Mark ‘T’ if the statement is true and ‘F’ if it is false:

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

Q 7.2 | Page 119

Mark ‘T’ if the statement is true and ‘F’ if it is false:

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

Q 7.3 | Page 119

Mark ‘T’ if the statement is true and ‘F’ if it is false:

The fishes have lungs for respiration. (T/F)

Q 7.4 | Page 119

Mark ‘T’ if the statement is true and ‘F’ if it is false:

The size of the chest cavity increases during inhalation. (T/F)

Q 7.5 | Page 119

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 those words are given below the square.

1) The air tubes of insects

2) Skeletal structures surrounding chest cavity

3) Muscular floor of chest cavity

4) Tiny pores on the surface of leaf

5) Small openings on the sides of the body of an insect

6) The respiratory organs of human beings

7) The openings through which we inhale

8)  An anaerobic organism

9) An organism with tracheal system

Q 8 | Page 119

The mountaineers carry oxygen with them because:

a) At an altitude 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.

Q 9 | Page 119

NCERT Science Class 7

Science Textbook for Class  7
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