Question

Protein is respiratory substrate in

• A. Seedling state
• B. Anaerobic respiration
• C. Protoplasmic respiration
• D. Floating respiration

Answer 1

The correct option is C Protoplasmic respiration

Carbohydrates and fats are the chief source of substrates used to carry out respiration. However, in the absence of these, the cells can switch over to proteins as a substrate. This is called protoplasmic respiration. It is an inefficient mode of respiration which produces ammonia as byproduct that can prove toxic for the cell. If the cell continues this for a long time, it ultimately dies.

So the answer is 'Protoplasmic respiration'