NCERT Solutions for class 7 Science Chapter-10

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NCERT Solutions for class 7 Science Chapter-10 Respiration in Organisms

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

 

Ans.1–  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 that usual  after finishing the race.

 

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

 

Ans.2– Similarities:-

  • In Both Respiration and food is broken down to release energy.

 

Differences:-

Aerobic Respiration Anaerobic Respiration
1. Takes Place in presence of O2 Takes place in absence of O2
2. It is slow process It is fast process
3. Energy is release in much amount Energy is release in least amount
4. Ex. Animals and Plants etc. Ex. Bacteria and human cells etc.

 

 

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

 

Ans.3– When we inhale lot of dust – laden air and these particles get pass the hair in nose and nasal cavity and irritate of the cavity which results are sneeze.

 

 

Q.4– Take three test-tubes. Fill each of them 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?

 

Ans.4– In Test tube – C have the highest concentration.

 

 

Q.5– Tick the correct answer:-

  1. In cockroaches, air enters the body through
  2. Lungs
  3. Gills
  • Spiracles
  1. Skin

Ans. a– iii. Spiracles

 

  1. During heavy exercise, we get cramps in the legs due to the accumulation of
  2. Carbon dioxide
  3. Lactic acid
  • Alcohol
  1. Water

Ans. b– ii. Lactic acid.

 

  1. Normal range of breathing rate per minute in an average adult person at rest is:
  2. 9 – 12
  3. 15 – 18
  • 21 – 24
  1. 30 – 33

 

Ans. c– ii. 15 – 18.

 

  1. During exhalation, the ribs
  2. Move outwards
  3. Move downwards
  • Move upward
  1. Do not move at all

 

Ans. d– ii. Move downward.

 

Q.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. Trachea

 

Ans.6–

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

 

 

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

  1. During heavy exercise the breathing rate of a person slows down. (T/F)
  2. Plants carry out photosynthesis only during the day and respiration only at night. (T/F)
  • Frogs breathe through their skins as well as their lungs. (T/F)
  1. The fishes have lungs for respiration. (T/F)
  2. The size of the chest cavity increases during inhalation. (T/F)

 

Ans.7–

  1. False
  2. False
  • True
  1. False
  2. True

 

Q.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.

 

  1. The air tubes of insect.
  2. Skeletal structure surround chest cavity.
  • Muscular floor of chest cavity.
  1. Tiny pores on the surface of leaf
  2. Small openings on the sides of the body of an insect.
  3. The respiratory organs of human beings.
  • The opening though which we inhale.
  • An anaerobic organism.
  1. An organism with tracheal system.

 

Ans.8–

  1. Trachea
  2. Ribs
  • Diaphragm
  1. Stomata
  2. Spiracles
  3. Lungs
  • Nostrils
  • Yeast
  1. Ant

(Student self search in word box)

 

Q.9– The mountaineers carry oxygen with them because:

  1. At an altitude of more than 5 km there is no air.
  2. The amount of air available to a person is less than that available on the ground.
  3. The temperature of air is higher than that on the ground.
  4. The pressure of air is higher than that on the ground.

 

Ans.9– b. The amount of air available to a person is less than that available on the ground.

NCERT Solutions for class 7 English Poem 

Transportation in Animals