Hormone produced more in dark is

Options

A. Thyroxine
B. Melatonin
C. Adrenaline
D. Insulin.

Answer

To answer the question "Hormone produced more in dark is," we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Hormones in the Options:**
- The options provided are thyroxine, melatonin, adrenaline, and insulin.

2. **Understand the Function of Each Hormone:**
- **Thyroxine:** Secreted by the thyroid gland, it helps in the oxidation of glucose and regulates metabolism.
- **Adrenaline:** Known as the emergency hormone, it is secreted by the adrenal glands and is involved in the body's fight-or-flight response.
- **Insulin:** Secreted by the beta cells of the pancreas, it regulates blood glucose levels by facilitating the uptake of glucose into cells.
- **Melatonin:** Secreted by the pineal gland, it regulates sleep-wake cycles and is involved in the body's circadian rhythms.

3. **Determine Which Hormone is Produced More in the Dark:**
- Melatonin is known to be produced in higher quantities during the night or in darkness. It helps regulate sleep and is influenced by light exposure.

4. **Conclusion:**
- Based on the functions and secretion patterns of the hormones discussed, the hormone that is produced more in the dark is **melatonin**.

### Final Answer:
The hormone produced more in dark is **melatonin**.

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