Question

Which of the following statements are correct for "Gibberelins"?
(A). There are 50 forms of Gibberelins.
(B). Gibberelins broke the dormancy.
(C). Gibberelins hastens senescence.
(D). Gibberelins hastens water uptake of plants.

Choose the correct answer from the options given below:

• A. (A), (B) and (D) only.
• B. (A) and (B) only.
• C. (C) and (D) only.
• D. (B), (C) and (D) only.

Hint:

Remember the classic hormonal actions:
- Abscisic acid (ABA) and ethylene promote/hasten senescence.
- Gibberellins, Auxins, and Cytokinins delay senescence.

Answer 1

The Correct Option is B

Step 1: Understanding the Concept:
Gibberellins (GAs) are crucial plant growth hormones that coordinate diverse developmental processes, including stem elongation, seed germination, and enzyme induction.

Step 3: Detailed Explanation:
Let us evaluate each statement:
- Statement (A): Historically, early plant physiology texts stated that there are over 50 distinct forms of gibberellins isolated from plants and fungi (though over 130 forms have been identified to date). Thus, under basic exam conventions, (A) is considered a correct biological fact.
- Statement (B): Gibberellins break seed and bud dormancy by activating hydrolytic enzymes (like amylase) that mobilize food reserves, triggering germination. Thus, (B) is correct.
- Statement (C): Gibberellins act as anti-aging hormones that delay leaf and fruit senescence (rather than hastening it). Thus, (C) is incorrect.
- Statement (D): Gibberellins do not directly accelerate the bulk water uptake mechanism of roots. Thus, (D) is incorrect.
Therefore, only statements (A) and (B) are correct.

Step 4: Final Answer:
The correct option is 2, which corresponds to (A) and (B) only.