Question

Which of the following is a plant hormone?

• A. Insulin
• B. Thyroxin
• C. Oestrogen
• D. Cytokinin

Answer 1

The correct option is D

Cytokinin

The correct option is D.

Explanation of correct option:

1. Cytokinin is the plant growth regulator hormone that helps in cell growth and cell division in the root and shoot of plants.

Explanation of incorrect options:

Option A

1. Insulin is secreted by islets of Langerhans of the pancreas.
2. It lowers the blood glucose level and is not considered a plant hormone.

Option B

1. Thyroxine is a hormone secreted by the thyroid gland it is responsible for growth development and increases metabolic rate.

Option C

1. Oestrogen is a female sex hormone that is responsible for the development of secondary sexual characteristics in females.
2. Hence it is not a plant hormone.

Final answer: Cytokinin is a plant growth regulator hormone.