In case of no fertilisation, corpus luteum ........ .

Options

A. Proliferates
B. Degenerates
C. Divides into half
D. Develops a fluidic cavity

Explanation

To answer the question "In case of no fertilisation, corpus luteum ........", we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Corpus Luteum**: The corpus luteum is a temporary endocrine structure that forms in the ovary after ovulation. It is responsible for producing hormones, primarily progesterone, which are crucial for maintaining the early stages of pregnancy.

2. **Role of Corpus Luteum in Fertilization**: If fertilization occurs, the corpus luteum is maintained by the hormone human chorionic gonadotropin (hCG) produced by the developing embryo. This hormone signals the corpus luteum to continue producing progesterone, which supports the pregnancy.

3. **What Happens if Fertilization Does Not Occur**: If fertilization does not take place, the corpus luteum does not receive the signal from hCG. As a result, it will not be maintained.

4. **Degeneration of Corpus Luteum**: Without fertilization, the corpus luteum will start to degenerate after about 10-14 days. This degeneration leads to a decrease in progesterone levels, which eventually triggers the onset of menstruation.

5. **Conclusion**: Therefore, in the case of no fertilization, the corpus luteum will degenerate.

### Final Answer:
The correct completion of the statement "In case of no fertilisation, corpus luteum ........" is: **degenerates**.

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