Question

Why do living organisms respire?

Answer 1

Respiration:

1. Respiration or cellular respiration is the process of release of energy by breaking down complex food molecules.
2. In plants and animals, glucose is broken down in the presence of oxygen to form carbon dioxide, water and large amounts of energy.
3. C₆H₁₂O₆ + 6 O₂→ 6 CO₂ + 6 H₂O + Energy (38 ATP)
4. The energy released is stored in the form of ATP (Adenosine triphosphate).
5. To carry out different life processes like movement, digestion, excretion, reproduction, living organisms require energy.
6. Plants need energy to perform photosynthesis.

Final answer: Living organisms respire to obtain energy.