Question

12.Which are the gases involved in breathing? *

2 points

(a) O2 and NO2

(b) O2 and SO2

(c) O2 and O3

(d) O2 and CO2

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Answer 1

Answer:

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Option D : O2 and CO2

O2 : Oxygen

CO2 : Carbon dioxide

Answer 2

(d) O₂ and CO₂ are the gases involved in breathing.

Breathing is the process of inhalation of oxygen and exhalation of carbon dioxide for respiration.

Process of Breathing:

• Inhalation: The process of breathing-in oxygen through the nostrils from the atmosphere is termed as inhalation.
• Exhalation: The process of breathing-out carbon dioxide is termed as exhalation.

Process of exchange of gases in lungs:

• Soon as the oxygen enters the lungs it diffuses into the bloodstream because of its shortage in blood.
• Simultaneously, carbon dioxide diffuses from the bloodstream to the lungs then comes out via nasal pathway.

Alveoli, a sac-like structure is mainly responsible for the exchange of gases within the lungs.