Question

When do plants respire?

• A. Day
• B. Night
• C. All of the time
• D. None of these

Answer 1

The correct option is C

All of the time

The correct option is C.

Explanation for the Correct Option:

• Respiration in plants involves the oxidation of the glucose molecules produced by photosynthesis. It results in the generation of energy, carbon dioxide, and water molecules.
• The plants generate energy all the time through respiration.
• In the daytime, a small portion of oxygen released by photosynthesis is used by plants to oxidize the carbohydrates for respiration.
• In the nighttime, plants take the oxygen from the environment to perform respiration.

Explanation for Incorrect Options:

Option A:

• The plants also generate energy during nighttime through respiration.

Option B:

• The energy generation also takes place during the daytime in plants through respiration.

Option D:

• Plants generate energy through respiration all of the time.

Therefore, respiration in plants occurs all the time, whether it is day or night.