Stomata

Hydathodes

1. Stomata are A tiny pore in a plant leaf surrounded by a pair of guard cells that regulate its opening and closure, and serves as the site for gas exchange.

1. A pore that exudes water on the surface or margin of a leaf of higher plants

2. Water is lost in the form of water vapour

2. Water is lost in its liquid form. 

3. Carry out the process of transpiration. 

3. Carry out the process of guttation. 

4. Usually open during the day and closed during the night.

4. Open all time.