Question

Stomata opens at night in which type of plants?

• A. \(C_3\)
• B. \(C_3\) and \(C_4\)
• C. \(C_4\)
• D. CAM

Hint:

CAM plants open stomata at night to reduce water loss in dry environments.

Answer 1

The Correct Option is D

Concept:
CAM stands for Crassulacean Acid Metabolism. CAM plants are adapted to dry conditions and open their stomata at night to reduce water loss.

Step 1: Understand stomatal opening.
Most plants open their stomata during the day for carbon dioxide intake.

Step 2: Special feature of CAM plants.
CAM plants open stomata at night and take in carbon dioxide when temperature is lower and water loss is less.

Step 3: Day time condition.
During the day, CAM plants keep stomata closed to conserve water and use stored carbon dioxide for photosynthesis. Therefore, stomata open at night in: \[ \text{CAM plants} \] \[ \therefore \text{Correct Answer is (D)} \]