Question

Choose the right from the following.
(i) In light, hormone auxin, helps the cells to grow longer in plants.
(ii) Plant hormone gibberellins help in growth of a stem.
(iii) Cytokinin inhibits cell division.
(iv) Abscisic acid promotes growth in plants.

• A. (I) and (iii) are correct.
• B. (ii) and (iv) are correct.
• C. (i) and (ii) are correct.
• D. (i) and (iv) are correct.

Answer 1

The correct option is C (i) and (ii) are correct.

In a shoot, the shaded side contains more auxin. This means that the shaded side grows longer, causing the shoot to bend towards the light. Gibberellins promote stem elongation between nodes on the stem. Cytokinins are a class of plant growth substances (phytohormones) that promote cell division, or cytokinesis, in plant roots and shoots. The plant hormone abscisic acid (ABA) is the major player in mediating the adaptation of the plant to stress.