If the concentration of salt in the soil is too high, the plants may wilt even if the field is thoroughly irrigated. Explain.

Percentage of water leaf in the soil when plant wilts is known as

Why do the leaves of a plant wilt when taken out of the soil?

A cut plant wilts fast even if its cut end is dipped in water.

A person takes concentrated solution of salt, after sometime, he starts vomiting. What is the phenomenon responsible for such situation? Explain.

A spherical conducting shell of inner radius r_(1) and outer radius r_(2) has a charge Q. (a) A charge q is placed at the center of the shell. What is the surface charge density on the inner and outer surfaces of the shell ? (b) Is the electric field intensity inside a cavity (with no charge) zero, even if the shell is not spherical, but has any irregular shape ? Explain.

Comment upon the following : Some plants show wilting of their leaves, even when the soil is well watered.

Give biological reason for the following statements : Plants growing in fertilized soil are often found to wilt if the soil is not adequately watered.

A farmer observed drops of water along the margins of leaves of tomato plants growing in his well irrigated field on a winter morning. Give reasons for this occurrence. Why the water drops appeared only along the leaf margins?

Assertion: The heliophytes possess high chlorophyll contents and low concentration of saIt and sugar. Reason: Due to this, plants are able to grow in shade also.

Given below are assertion and reason. Assertion. When the ambient temperature is high and the soil contains exces of water, the plants tend to loss water in the form of droplets from lenticels Reason . Root pressure regulates the rate of loss of water from lenticels .