Question

What is the importance of respiration in organisms?

• A. It provides oxygen to plant.
• B. It liberates oxygen.
• C. It liberates $C{O}_2$.
• D. All of the above.

Answer 1

The correct option is C It liberates $C{O}_2$.

Respiration is a catabolic process, which oxidises reduced substrates, thus, resulting in the energy stored in reduced substrates. The reduced substrates are produced by the process of photosynthesis occurring in green plants and the reduced substrates are oxidised through respiration releasing CO${}_2$, water vapour and energy in the form of ATP.

So, the correct answer is 'It liberates CO${}_2$'