Question

why should we water the soil in which plant is grown not its leaves ​

Answer 1

Explanation:

If water condenses on the leaf during high humidity, such as fog, then plants can take in some of that surface water. The bulk of water uptake by most plants is via the roots. That said, high humidity does decrease the rate at which water is lost from the plant, and so will decrease the uptake of water from the soil.

Answer 2

If water condenses on the leaf during high humidity, such as fog, then plants can take in some of that surface water. The bulk of water uptake by most plants is via the roots. That said, high humidity does decrease the rate at which water is lost from the plant, and so will decrease the uptake of water from the soil