Enzyme secreted by sperm is

Options

A. Sperm trypsin
B. Sperm lysin
C. Male hormone
D. Sperm gastrin.

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks about the enzyme that is secreted by sperm. This requires knowledge of reproductive biology and the role of sperm in fertilization.

2. **Identifying the Options**: The options provided are:
- A) Sperm trypsin
- B) Sperm lysin
- C) Male hormone
- D) Sperm gastrin

3. **Analyzing Each Option**:
- **A) Sperm trypsin**: Trypsin is a proteolytic enzyme, but it is not specifically associated with sperm.
- **B) Sperm lysin**: This is known to be an enzyme secreted by sperm that helps in penetrating the egg by creating a hole in its protective layers.
- **C) Male hormone**: This is not an enzyme but refers to hormones like testosterone, which are not secreted by sperm.
- **D) Sperm gastrin**: Gastrin is a hormone that stimulates gastric acid secretion, unrelated to sperm function.

4. **Selecting the Correct Answer**: Based on the analysis, the correct answer is **B) Sperm lysin**. This enzyme plays a crucial role in fertilization by allowing sperm to penetrate the egg.

5. **Conclusion**: The enzyme secreted by sperm is sperm lysin, which facilitates the entry of sperm into the egg.

**Final Answer**: B) Sperm lysin

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