Assertion :- Thyroxine hormone acts for longer duration.
Reason:- Thyroxine hormone is amino acid derivative

Options

A. If both assertion and reason are true and reason is the correct explanation of assertion
B. If both assertion and reason are true but reason is not the correct explanation of assertion
C. If assertion is true but reason is false
D. If both assertion and reason are false.

Answer

To solve the question regarding the assertion and reason related to the thyroxine hormone, we can break it down step by step:

### Step 1: Understand the Assertion
- **Assertion:** Thyroxine hormone acts for a longer duration.
- **Explanation:** Thyroxine, produced by the thyroid gland, is known to have a prolonged effect on metabolism and growth regulation. This is due to its ability to enter cells and influence gene expression, leading to long-lasting physiological changes.

### Step 2: Understand the Reason
- **Reason:** Thyroxine hormone is an amino acid derivative.
- **Explanation:** Thyroxine is indeed derived from the amino acid tyrosine. It is classified as an amino acid derivative hormone, which is important for understanding its structure and function.

### Step 3: Evaluate the Relationship Between the Assertion and Reason
- Both the assertion and reason are true statements. However, the reason does not provide a direct explanation for why thyroxine acts for a longer duration. The duration of action is more related to its mechanism of action (similar to steroid hormones) rather than just its classification as an amino acid derivative.

### Step 4: Choose the Correct Option
- Based on the evaluation, we can conclude:
- Both assertion and reason are true.
- The reason is not the correct explanation of the assertion.

Thus, the correct option is:
**Option 2:** Both assertion and reason are true, and reason is not the correct explanation of assertion.

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