Question

Ageing in plants can be delayed by spraying:

• A. Gibberellins
• B. Cytokinins
• C. Ethylene
• D. Auxins

Answer 1

The correct option is B

Cytokinins

The correct option is B

Explanation of the correct option :

1. Cytokinins are plant growth hormones and they act in the presence of auxins or gibberellins.
2. Cytokinins stimulate the radial growth of stem tissue.
3. They help in the retardation of senescence (ageing of plants). They regulate the growth of roots and stems.

Explanation of the incorrect option:

Option A:

It is a growth-controlling plant hormone. It helps in stem elongation, seed germination, and breaking of seed dormancy and it also induces the flowering of many plants.

Option C:

It is a gaseous plant hormone that helps in fruit ripening and leaf abscission.

Option D:

They are water-soluble plant growth hormones that help in cell division, cell elongation, regulation of apical dominance, controlling of tropic movement, etc.