The diagram given below is a representation of K⁺ transport mechanism of stomatal opening and closing. Study the same and answer the questions that follows:

(a) Name the cell labelled as A.

(b) Mention the states of guard cells represented by B and C.

(c) What causes closure of stomata during night?

Two potted plants are fixed horizontally in clinostat. One is rotated and the other is not. What will be your observation after some time?

Give the exact location of pituitary gland.

Enlist some of the consequences of population explosion.