Testis performs dual functions by acting as

Options

A. Endocrine gland
B. Primary sex organ
C. Stimulate immune system
D. Both (1) & (2)

Answer

**Step-by-Step Solution:**

1. **Identify the Testis Functions**: The testis is a paired male sex organ that performs two primary functions.

2. **Function as a Primary Sex Organ**: The first function of the testis is to produce male gametes, which are sperm. This makes the testis a primary sex organ.

3. **Hormone Secretion**: The second function is the secretion of hormones, specifically testosterone. Testosterone is a male sex hormone that plays a crucial role in the development of male primary and secondary sexual characteristics.

4. **Endocrine Function**: Since the testis secretes testosterone, it also acts as an endocrine gland. This means it releases hormones directly into the bloodstream, influencing various bodily functions.

5. **Evaluate the Options**:
- Option 1 states that the testis acts as an endocrine gland – this is correct.
- Option 2 states that it acts as a primary sex organ – this is also correct.
- Option 3 suggests that it stimulates the immune system – this is incorrect, as the testis does not have a role in immunity.
- Therefore, options 1 and 2 are correct.

6. **Conclusion**: The correct answer is that the testis performs dual functions by acting as both an endocrine gland and a primary sex organ.