Question

The process of respiration is concerned with the
a) Liberation of oxygen.
b) Liberation of carbon dioxide.
c) Liberation of energy
d) Intake of oxygen.

Answer 1

Hint: Respiration is one of the most important processes of living organisms. It is concerned with the breathing process that involves gaseous exchange between organism and the environment thus, takes place in both animals and plants.

Complete answer
Respiration is a process, common to both animals and plants but is different in process. In animals, the process involves intake of oxygen for oxidation of complex organic materials and consequent release of carbon dioxide takes place whereas in plants, intake of carbon dioxide and release of oxygen (also called photorespiration) takes place. However, in plants this process reverses in night and becomes similar to that of animals (also called dark respiration).
The main purpose of this process is to liberate energy which can be further used by the organism to conduct various metabolic activities. Therefore, option C is the correct answer.
Liberation of carbon dioxide and intake of oxygen in the process of respiration are only the steps of the respiration process and not the main goal. Therefore, option B and D that is liberation of carbon dioxide and intake of oxygen cannot be considered as correct options.
Also, the process of respiration does not involve liberation of oxygen in either plants or animals, so option A is an incorrect option.

Note:
The process of respiration must not be confused with food manufacturing cycles that are photosynthesis in plants and digestion in animals. It involves breakdown of glucose which is the ultimate food product or energy source for all organisms.