Question

Which of these is not a plant hormone?

• A. Gibberellin
• B. Insulin
• C. Ethylene
• D. Cytokinin

Answer 1

The correct option is B

Insulin

The correct answer is option B :

Explanation of the correct option :

1. Insulin is an animal hormone and when the body digests food wealthy in sugars, glucose is delivered into the circulatory system.
2. When the glucose levels are high, these hormones act as messengers to transport the glucose to various cells in the body.

Explanation of the incorrect option :

Option A

Gibberellins are the plant growth regulators involved in regulating the growth and influencing different developmental processes which include stem elongation, germination, flowering, enzyme induction, etc.

Option B

1. Ethylene is a plant growth regulator that acts as a trace level of entire plant life by regulating and stimulating the opening of flowers, fruit ripening, and shedding of leaves.
2. This plant hormone is essentially produced in all parts of grown plants including roots, stems, tubers, leaves, flowers, fruits, and seeds.

Option C

1. Cytokinins are a group of plant growth regulators which are primarily involved in performing cell division in plant roots and shoot systems.
2. This hormone helps in promoting the cell’s growth, development, and differentiation, affecting apical dominance and delay in leaf senescence.

Final Answer: Insulin is not a plant hormone