Which of the following larval stage exhibit polyembryony?

Options

A. Sporocyst
B. Cercaria
C. Redia
D. Both (1) & (3)

Answer

To determine which larval stages exhibit polyembryony, we can follow these steps:

### Step-by-Step Solution:

1. **Understand Polyembryony**:
- Polyembryony is the phenomenon where two or more embryos develop from a single fertilized egg. This means that one egg can give rise to multiple embryos.

2. **Identify the Organisms**:
- Polyembryony is commonly observed in certain parasitic organisms, particularly in flatworms known as trematodes.

3. **Recognize the Larval Stages**:
- In trematodes, the larval stages that are known to exhibit polyembryony include:
- **Sporocyst**
- **Redia**

4. **Evaluate the Options**:
- Given the options:
- Option 1: Sporocyst
- Option 2: Cercaria
- Option 3: Redia
- Option 4: Both 1 and 3
- We analyze each option:
- **Sporocyst** (Option 1) - Correct, as it exhibits polyembryony.
- **Cercaria** (Option 2) - Incorrect, as it does not exhibit polyembryony.
- **Redia** (Option 3) - Correct, as it also exhibits polyembryony.
- **Both 1 and 3** (Option 4) - Correct, since both sporocyst and redia exhibit polyembryony.

5. **Select the Correct Answer**:
- The correct answer is **Option 4: Both 1 and 3**, as both sporocyst and redia are larval stages that exhibit polyembryony.

### Final Answer:
**Option 4: Both 1 and 3**

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