Write one main function of sunken stomata.

Give reason for the following:

The rate of transpiration increases in hot and dry weather.

Give reasons for the following:

Water transpired is water absorbed.

Give reasons for the following:

In some xerophytes, leaves are modified into spines.

Give reasons for the following:

Antitranspirants can be used to keep cut flowers fresh for a long time.

Give reasons for the following:

Balsam plants wilt during midday even if the soil is well watered.

Give reasons for the following:

The leaves of certain plants roll up on a bright sunny day.