Question

Ethylene synthesis in plants is induced by environmental stress and

• A. gibberellins
• B. cytokinin
• C. auxin
• D. abscisic acid

Answer 1

The correct option is C

auxin

The correct option is C.

Explanation for the correct option-

1. Auxin is a natural growth hormone secreted by plants, that promotes the growth of plant shoots and roots and the apical buds.
2. This hormone aids in the formation of ethylene under environmental stress conditions.
3. Ethylene is a gaseous hormone that facilitates the senescence of plants and the ripening of fruits.

Explanation for incorrect options-

Option A:

1. Gibberellins increase the length of the plants, help plants to overcome dormancy and induce parthenocarpy.
2. However, gibberellins do not induce the production of ethylene under any condition.

Option B:

1. Cytokinins regulate cell division in plants and induce flowering.
2. These hormones also do not stimulate the production of ethylene under stress conditions.

Option D:

1. Abscisic acid is a plant hormone that is responsible for seed dormancy and growth inhibition.
2. It is also referred to as a stress hormone as it helps to sustain the plant under stressful conditions.
3. Abscisic acid also does not stimulate the production of ethylene under stress conditions.

Final Answer: Ethylene synthesis is induced in plants under environmental stress and due to the influence of auxin.