Question

Assertion (A): Vernalization is seen in Biennials
Reason (R): Cold treatment stimulates photo-periodic flowering response in cabbage.

• A. Both A and R are correct. R is the correct explanation of A.
• B. Both A and R are correct, but R is not the correct explanation of A.
• C. A is correct but R is incorrect.
• D. A is incorrect but R is correct.

Hint:

Vernalization ensures flowering in biennials like cabbage by preparing them to respond to photoperiod cues after cold exposure.

Answer 1

The Correct Option is A

Vernalization is the induction of a plant's flowering process by exposure to a prolonged period of cold temperatures. It is commonly observed in biennial plants such as cabbage, beet, and carrot, which require a chilling period to initiate flowering in the second year of growth.
Cabbage is a biennial plant that exhibits a strong vernalization response — exposure to cold triggers the photo-periodic flowering response. This means that after vernalization, the plant becomes competent to respond to day-length conditions, thereby initiating flowering.
Thus:
- Assertion (A) is correct: Vernalization is indeed seen in biennials.
- Reason (R) is also correct and explains why vernalization is important in cabbage (a biennial), linking cold treatment to its flowering mechanism.

Answer 2

Assertion (A): Vernalization is seen in Biennials.
Reason (R): Cold treatment stimulates photo-periodic flowering response in cabbage.

Vernalization is the process of exposing plants to a period of low temperature to induce flowering. This is commonly observed in biennial plants, which require this cold period to transition from the vegetative to the flowering stage.

Biennials like cabbage need vernalization because they grow vegetatively in the first year and flower in the second year after experiencing cold.

The reason (R) explains that cold treatment triggers the photo-periodic flowering response in cabbage, which is a typical biennial.

Thus, both assertion and reason are correct, and the reason correctly explains the assertion.

Correct Answer: Both A and R are correct. R is the correct explanation of A.