Contractile vacuole is not found in

Options

A. Sarcodine
B. Sporozoa
C. Zooflagellata
D. Slime moulds.

Answer

To determine where the contractile vacuole is not found, we will analyze each of the given options one by one.

### Step-by-Step Solution:

1. **Understanding Contractile Vacuole**:
- The contractile vacuole is an organelle found in some protozoans that helps in osmoregulation, which is the regulation of water and salt balance within the cell.

2. **Analyzing Option 1: Sarcoidin**:
- Sarcoidin is a type of protozoan.
- It is known to possess a contractile vacuole for osmoregulation.
- **Conclusion**: Contractile vacuole is present in Sarcoidin. (This option is incorrect for our question.)

3. **Analyzing Option 2: Sporozoa**:
- Sporozoa, such as Plasmodium (the causative agent of malaria), do not have a contractile vacuole.
- They are known for their spore-like infective stages and do not require a contractile vacuole for osmoregulation.
- **Conclusion**: Contractile vacuole is absent in Sporozoa. (This option is correct for our question.)

4. **Analyzing Option 3: Zooplankton**:
- Zooplankton includes various protozoans, many of which do possess a contractile vacuole.
- **Conclusion**: Contractile vacuole is present in Zooplankton. (This option is incorrect for our question.)

5. **Analyzing Option 4: Slime Mold**:
- Slime molds are a type of protist that exhibit characteristics of fungi and protozoa.
- They are saprophytic and do have a contractile vacuole to manage water balance.
- **Conclusion**: Contractile vacuole is present in Slime Mold. (This option is incorrect for our question.)

### Final Answer:
The contractile vacuole is not found in **Sporozoa**.

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