Question

The products of respiration are

• A. nitrogen and carbon dioxide.
• B. water vapour and carbon dioxide.
• C. water vapour and nitrogen.
• D. only carbon dioxide.

Answer 1

The correct option is B

water vapour and carbon dioxide.

The explanation for the correct option- (B) water vapour and carbon dioxide.

Respiration - The process by which organisms get energy by the conversion of glucose in the presence of oxygen into carbon dioxide and water vapour. It is the reverse process of photosynthesis.

$\mathrm{Glucose}\left(\mathrm{s}\right)+\mathrm{Oxygen}\left(\mathrm{g}\right)\to \mathrm{Carbon}\mathrm{dioxide}\left(\mathrm{g}\right)+\mathrm{Water}\mathrm{vapour}\left(\mathrm{g}\right)+\mathrm{Energy}$

The explanation for the incorrect options -

(A) nitrogen and carbon dioxide - Nitrogen gas is not involved in the process of respiration.

(C) water vapour and nitrogen - Nitrogen gas is not involved in the process of respiration.

(D) only carbon dioxide - Water vapour is also released as a product of respiration.

Hence, option (B) is correct. The products of respiration are water vapour and carbon dioxide.