Tag: guttation

The process of exudation of sap on the tips or edges of leaves in plant is called guttation. It takes place only under certain conditions like cold and high relative humidity in the atmosphere. It occurs through the specialized structures called hydathodes. They are generally restricted to the apex or the edges of the margins of leaves. Structurally, hydathodes consist of a simple pore in the epidermal layer found at the tip.

Guttation is the excretion of drops of xylem sap on the tips or edges of leaves of some vascular plants, such as grasses. It is the loss of water in liquid form through hydathodes.

The soil rich in moisture content, water floods a plant root system. Leaves can retain only a finite amount of water. Excess water i.e xylem sap is given out from the roots through pores or edge of leaves and this process is called guttation. Thus the correct answer is option B.

Transpiration is the process in which water vapors are released from the stomata. Guttation is the process of release of water droplets from the hydathodes.

Guttation is the loss of water in liquid form as a dilute solution from uninjured leaf tips. The uninjured leaf tips have hydathodes or water stomata. Under conditions of low transpiration dilute solution of minerals oozes out through them under the influence of increased root pressure.

Root pressure is osmotic pressure within the cells of a root system. Root pressure is generated by active uptake of minerals by roots, which lowers water potential of root cells and water flows inside the cells along its concentration gradient. Thus, on the cutting of shoot, excretion of watery substance from cut side occurs.

All plants do not show guttation. It is restricted to about 345 genera of herbaceous and some woody plants.
e.g., Garden Nasturtium, Oat Balsum, Tomato etc

Transpiration is the process where plants absorb water through the roots and then give off water vapor through pores in their leaves.

Guttation is the loss of water in the form of droplets along the margin and tips through special structures called hydathode. The guttational drops comprise of water various salts dissolved in it. 
Thus, the correct answer is option (B). 

Guttation is the loss of water in the form of liquid from the uninjured margins of the leaves is called guttation. The pores are known as hydathodes. The level of soil moisture is high which creates greater root pressure. This root pressure creates a force which allows exudation of water from the tips. It is favored when the transpiration is suppressed and the relative humidity is high
Thus the correct answer is option (A).