Question

Which of the following hormones can replace vernalisation?

• A. auxin
• B. cytokinin
• C. gibberellins
• D. ethylene.

Answer 1

The Correct Option is C

To solve the question of which hormone can replace vernalisation, we need to understand the biological concept of vernalisation and the role of plant hormones.

Concept of Vernalisation:

Vernalisation refers to the process of inducing flowering in plants by exposing them to prolonged cold temperatures. It is a crucial process for certain plant species, particularly in temperate climates, to ensure that flowering occurs at an optimal time when conditions are favorable.

Hormones Involved in Plant Growth and Development:

1. Auxins: These hormones are primarily involved in cell elongation, root initiation, and growth regulation.
2. Cytokinins: These play a role in cell division and growth, delaying leaf senescence, and influencing nutrient mobilization.
3. Gibberellins: These are known for their role in breaking seed dormancy, promoting germination, and stimulating flowering in some plants. Gibberellins can mimic the effects of cold treatment by promoting flowering similar to vernalisation.
4. Ethylene: This hormone largely deals with fruit ripening and abscission of leaves and fruits.

Conclusion and Correct Answer:

Gibberellins can replace vernalisation because they promote similar physiological responses in plants, such as initiating flowering and seed germination. This hormone has been shown to substitute for the cold treatment required in vernalisation.

Hence, the correct answer is gibberellins.