Select the mismatched pair.

Options

A. FSH secretion- stimulate Sertoil cells
B. Secretion of relaxin in the later phase of pregnancy - Human placenta
C. Diaphragms, cervical caps and vaults - Physical barriers of contraception
D. Human egg- Fertilization in fallopian tube

Answer

To solve the question of selecting the mismatched pair, we will analyze each option provided in the question step by step.

### Step 1: Analyze the first option
- **Statement**: FSH secretion stimulates Sertoli cells.
- **Explanation**: Follicle-Stimulating Hormone (FSH) is indeed responsible for stimulating Sertoli cells in the testes. Sertoli cells play a crucial role in supporting and nourishing developing sperm cells. Therefore, this statement is **true**.

### Step 2: Analyze the second option
- **Statement**: Secretion of relaxin in the later phase of pregnancy.
- **Explanation**: Relaxin is a hormone that is primarily secreted during childbirth (parturition) to facilitate the process. It is not specifically secreted in the later phase of pregnancy but rather during labor. Thus, this statement is **incorrect**.

### Step 3: Analyze the third option
- **Statement**: Diaphragms, cervical caps, and vaults are physical barriers of contraception.
- **Explanation**: This statement is accurate as diaphragms and cervical caps are indeed physical barriers used in contraception to prevent sperm from entering the uterus. They are often used with spermicidal agents to enhance their effectiveness. Therefore, this statement is **true**.

### Step 4: Analyze the fourth option
- **Statement**: Human egg fertilization occurs in the fallopian tube.
- **Explanation**: The fertilization of the human egg typically occurs in the ampullary region of the fallopian tube. This is a well-established fact in human reproductive biology. Thus, this statement is **true**.

### Conclusion
After analyzing all the options, we find that the second option regarding the secretion of relaxin in the later phase of pregnancy is the only incorrect statement.

### Final Answer
The mismatched pair is: **Secretion of relaxin in the later phase of pregnancy**.

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