Question

Account for the following:

The leaves of certain plants roll up on a bright sunny day.

Answer 1

Curling/rolling of leaves:

1. The bright sun causes loss of water from plants, causing wilting of leaves.
2. Plants curl their leaves to reduce water loss from stomata by transpiration.
3. It is an adaptation in plants to reduce wilting and prevent transpiration.
4. Curling of leaves on a bright sunny day helps plants to reduce water loss.