Does diffusion play a role in the passage of water vapour from the leaf during transpiration? If so, how?

In any experiment to demonstrate transpiration, the leaf must remain attached to its parent plant. Why is this so?

How will the following conditions affect transpiration ?

(i) Still air

(ii) Midday high temperature

(iii) Dry air

(iv) Dim sunlight

(v) Insufficient absorption of water by the roots

List any three adaptations in plants to reduce transpiration.