Question

Stomata can open at night in ______.

Options

• xerophytes

• gametophytes

• hydrophytes

• none of these

Answer 1

Stomata can open at night in xerophyte.

Explanation:

Certain desert-dwelling xerophytes (such as cacti and succulent plants) utilise a specialised metabolic pathway called Crassulacean Acid Metabolism (CAM) to conserve precious water. These plants keep their stomata tightly closed during the hot, dry daytime to prevent dehydration and open them exclusively at night when temperatures drop and humidity rises. At night, they absorb carbon dioxide and store it as organic acids, which are then utilised for photosynthesis the following day.