Biology Do as Directed.

Lenticels:-Lenticels are the special openings that develop in the older stem to facilitate loss of water as water vapour.

Leaf spines:- Leaves are reduced to spines in some plants to reduce surface area for transpiration.

Sunken stomata:- They reduce the rate of water loss by transpiration.

Hydathodes:-They are the special marginal structures that help to ooze out water droplets from the leaf margins.

Stomata:- Stomata are the tiny pores on the epidermal surface of leaves that help in gaseous exchange and release of water vapour from the plant.

Root pressure :- Root pressure is the positive pressure inside the xylem of the roots as a result of water movement up to the xylem.

Bleeding in plants:- It is the exudation of sap from the injured parts of the plants.

Guttation:- It is defined as the loss of water droplets from the hydathodes of plants. It occurs when the root pressure is high and transpiration is low. Water drops ooze out through special marginal structures known as hydathodes

Transpiration:- It is defined as the loss of water in the form of water vapour from the surface of the aerial parts of plants, mainly from the leaves.