Of the processes which occur in leaves,the one which may lower their temperature (cooling effect) is

Wilting and curling of leaves occur due to which factor?

What is guttation?

Guttation may be defined as a process in which plants can

Which of the following walls of guard cells is thick?

If the rates of transpiration and water absorption of a flowering plant are measured over a period of $24$ hours,it is found that the rate of transpiration reaches its peak at about mid-day and then declines,whereas the peak for water absorption is reached approximately two hours later. Which one of the following statements provides the best explanation of these results?