Read the following staisiients. A. ABA is derived from violaxanthin and is also known as anti GA hormone. B. Ethylene increases the number of male flowers. C. Extrinsic factors like temperature and light control plant growth and development via PGRs. D. GA, is used to speed up the malting process in brewing industry Choose the correct option.

Options

A. Only A is incorrect
B. Only B is incorrect
C. A, B and C are incorrect
D. B, C and D are incorrect

Answer

To solve the question, we need to evaluate each statement regarding plant growth regulators (PGRs) and their functions. Let's analyze each statement step by step:

### Step 1: Analyze Statement A
**Statement A:** "ABA is derived from violaxanthin and is also known as anti GA hormone."

- **Analysis:** Abscisic acid (ABA) is indeed derived from carotenoid precursors, and violaxanthin is one of them. ABA is often referred to as the "anti-gibberellin" hormone because it inhibits growth, which is the opposite effect of gibberellic acid (GA).
- **Conclusion:** This statement is **correct**.

### Step 2: Analyze Statement B
**Statement B:** "Ethylene increases the number of male flowers."

- **Analysis:** Ethylene is known to promote the formation of female flowers in many plant species, particularly in dioecious plants. It plays a significant role in fruit ripening and is considered a reproductive hormone. Therefore, the claim that ethylene increases the number of male flowers is incorrect.
- **Conclusion:** This statement is **incorrect**.

### Step 3: Analyze Statement C
**Statement C:** "Extrinsic factors like temperature and light control plant growth and development via PGRs."

- **Analysis:** Extrinsic factors such as temperature and light do indeed influence plant growth and development. They interact with plant growth regulators (PGRs) to modulate various physiological processes. This statement accurately reflects the relationship between environmental factors and PGRs.
- **Conclusion:** This statement is **correct**.

### Step 4: Analyze Statement D
**Statement D:** "GA is used to speed up the malting process in the brewing industry."

- **Analysis:** Gibberellic acid (GA) is commonly used in the brewing industry to enhance the malting process. It helps in the germination of barley and the conversion of starches into sugars, which are essential for brewing. This statement is accurate.
- **Conclusion:** This statement is **correct**.

### Final Conclusion
After analyzing all statements:
- **Correct Statements:** A, C, D
- **Incorrect Statement:** B

### Answer
The correct option is that statements A, C, and D are correct, while statement B is incorrect.

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