NCERT Solutions For Class 7 Science : Chapter 10 Respiration in Organisms

NCERT Solutions For Class 7 Science Chapter 10 PDF Free Download

NCERT solutions class 7 Science Chapter 10 Respiration in Organisms is crucial for the students of 7th standard. The solutions are provided here to help students understand the chapter in an interesting way. These NCERT Solutions for chapter 10 of class 7 Science is created by subject experts according to the latest CBSE syllabus. Students must practice the solutions regularly to prepare effectively for their examination.

NCERT solutions for class 7 science chapter 10 is outlined in such a way that every student can comprehend the concepts easily. This NCERT solutions, class 7 science chapter 10, comprises of a wide range of topics.

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NCERT solutions class 7 science chapter 10 part 1
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Access Answers of NCERT Solutions for Class 7 Science Chapter 10 Respiration in Organisms

Exercise Questions

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

Solution:

The athlete needs a lot of energy during the race, and for the release of energy, they need a lot of Oxygen; hence they breathe faster and more profound than usual after finishing the race.

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

Solution:

Similarities: In both kinds of respiration, food particles are broken down to finer constituents.

Differences

Aerobic respiration

Anaerobic respiration

Takes place in the presence of Oxygen

Takes place in the absence of Oxygen

End products are CO2 and H2O

End products are CO2 and alcohol

Produces a large amount of energy

The energy released is less when compared to aerobic respiration

It occurs in most plants and animals

Occurs in yeast and some bacteria

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

Solution:

When we inhale dust-laden air, dust irritates nose; As reflexive action, dust is thrown out through sneezing.

4. Take three test-tubes. Fill ¾th 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 ?

Solution:

Test tube A will have the highest concentration of CO2 because test-tube A will have Snail which expels out CO2 into the tube. In tube C, there is a plant which will inhale CO2 to decrease CO2 concentration in the tube C.

5. Tick the correct answer:

(a) In cockroaches, air enters the body through

(i) lungs (ii) gills (iii) 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

Solution:

a) (iii) spiracles

b) (ii) lactic acid

c) (ii) 15–18

d) (ii) move downwards

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) Lungs and skin

(vii) Trachae

Solution:

Column I

Column II

(a) Yeast

(iii) Alcohol

(b) Diaphragm

(iv) Chest cavity

(c) Skin

(i) Earthworm

(d) Leaves

(v) Stomata

(e) Fish

(ii) Gills

(f) Frog

(vi) Lungs and skin

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

(i) During heavy exercise the breathing rate of a 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 lungs for respiration. (T/F)

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

Solution:

i) False

ii) False

iii) True

iv) False

v) True

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 those words are given below the square.

Puzzle on respiration

(i) The air tubes of insects

(ii) Skeletal structures surrounding chest cavity

(iii) Muscular floor of chest cavity

(iv) Tiny pores on the surface of leaf

(v) Small openings on the sides of the body of an insect

(vi) The respiratory organs of human beings

(vii) The openings through which we inhale

(viii) An anaerobic organism

(ix) An organism with tracheal system

Solution:

(i) Trachea

(ii) Ribs

(iii) Diaphragm

(iv) Stomata

(v) Spiracles

(vi) Lungs

(vii) Nostrils

(viii) Yeast

(ix) Ant

9. 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.

Solution:

The answer is (b) The amount of air available to a person is less than that available on the ground.

Important topics covered in NCERT Solutions for Class 7 Science Chapter 10 Respiration in Organisms

  • Why do we respire?
  • Breathing
  • How do we breathe?
  • What do we breathe out?
  • Breathing in other animals
  • Breathing underwater
  • Do plants also respire?

BYJU’S presents you with NCERT Solutions that will help you to grasp the topics. These NCERT solutions are the result of thorough research and experience of BYJU’S subject experts.

Frequently Asked Questions on Respiration in Organisms

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

The athlete needs a lot of energy during the race, and for the release of energy, they need a lot of Oxygen; hence they breathe faster and more profound than usual after finishing the race.

List the similarities of aerobic and anaerobic respiration?

In both kinds of respiration, food particles are broken down to finer constituents.

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

When we inhale dust-laden air, dust irritates nose; As reflexive action, dust is thrown out through sneezing.

3 Comments

  1. The answer of Q-8, xi part is wrong

    1. Dear Akshat,

      Ants do not possess lungs. They breathe through tiny holes in their sides known as spiracles, which is positioned in each segment which leads to a network of tiny tubules known as Trachea.

      If you are looking for Cockroach as the answer, Cockroaches do possess a tracheal system, but this option is not mentioned in the square of letters.
      Thanks

      1. You’re right

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