NCERT Class VII Science Solutions: Chapter 10-Respiration in Organisms Part 1 (For CBSE, ICSE, IAS, NET, NRA 2022)

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Question 1:

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


When the athlete runs in the race, his body needs more energy. In order to get extra energy, the athlete breathes faster. Because more oxygen is supplied to our cells. It speeds up the breakdown of food and more energy is released.

As Showing in Images is a Result for Tired at Running

Question 2:

List the similarities and differences between aerobic and anaerobic respiration.


  • Similarities: Food is oxidized in both cases and energy is released.
  • Differences: Carbon dioxide and water are the end products of aerobic respiration, while alcohol is the end product of anaerobic respiration. Aerobic respiration releases more energy than anaerobic respiration.
As Showing in Images is a Result for Anaerobic

Question 3:

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


When dust particles enter our nostril, it triggers a message to the brain. The brain instructs the nasal chamber to initiate sneezing. This is a method to remove the unwanted dust particles from the nostrils. Sneezing is a type of defense mechanism used by our body.

As Showing in Images is a Inhale a Lot of Dust-Laden Air