Question

A stomata closes when:

1. it needs carbon dioxide for photosynthesis.
2. it does not need carbon dioxide for photosynthesis.
3. water flows out of the guard cells.
4. water flows into the guard cells.

The correct reason(s) in this process is/are ______.

विकल्प

• i only

• i and iii

• ii and iii

• ii and iv

Answer 1

ii and iii

A stomata closes when the correct reasons in this process are it does not need carbon dioxide for photosynthesis and water flows out of the guard cells.

Explanation:

When the plant does not need CO₂ for photosynthesis (e.g., at night), the stomata close to prevent water loss.

Water flows out of the guard cells, making them flaccid, which leads to stomatal closure.