In Taenia Self-fertilisation lakes place

Options

A. Between two gravid proglottids
B. Within same gravid proglottid
C. Within same mature proglottid
D. Between two immature proglottids

Answer

### Step-by-Step Solution:

1. **Understanding Taenia**: Taenia is a genus of parasitic flatworms, commonly known as tapeworms. They have a segmented body structure.

2. **Identifying Proglottids**: Proglottids are the segments of the tapeworm that contain the reproductive organs. Each proglottid can be considered a complete reproductive unit.

3. **Reproductive Organs**: In Taenia, mature proglottids contain both male and female reproductive organs. This means that they have the capability to perform both self-fertilization and cross-fertilization.

4. **Self-Fertilization Mechanism**: Since both reproductive organs are present in the same mature proglottid, self-fertilization can occur. This means that the sperm from the male organs can fertilize the eggs in the female organs within the same proglottid.

5. **Evaluating Options**:
- Option 1: "Occurs between two gravid proglottids" - This is incorrect because fertilization occurs in mature proglottids, not specifically in gravid ones.
- Option 2: "Within the same gravid proglottid" - This is also incorrect; while it mentions the same proglottid, it incorrectly specifies 'gravid'.
- Option 3: "Within the same mature proglottid" - This is correct as it aligns with our understanding that self-fertilization occurs within a mature proglottid.
- Option 4: "Between two immature proglottids" - This is incorrect because immature proglottids do not have fully developed reproductive organs.

6. **Conclusion**: The correct answer is that self-fertilization occurs within the same mature proglottid.