Which of the following is not a locomotory organelle of protozoans

Options

A. (a) Pseudopodia
B. (b) Cilia
C. (c) Flagella
D. (d) Parapodia

Answer

To determine which of the following is not a locomotory organelle of protozoans, we will analyze each option one by one.

### Step 1: Analyze Pseudopodia
- **Definition**: Pseudopodia are temporary, arm-like projections of the cell membrane.
- **Example**: They are primarily found in amoeba.
- **Function**: Pseudopodia are used for locomotion and feeding.

### Step 2: Analyze Cilia
- **Definition**: Cilia are short, hair-like structures that cover the surface of some protozoans.
- **Example**: Cilia are found in paramecium.
- **Function**: They help in locomotion and feeding by creating water currents.

### Step 3: Analyze Flagella
- **Definition**: Flagella are long, whip-like structures that extend from the cell body.
- **Example**: Flagella are found in euglena.
- **Function**: They assist in locomotion and can also play a role in sensing the environment.

### Step 4: Analyze Parapodia
- **Definition**: Parapodia are fleshy, lateral outgrowths from the body.
- **Example**: They are found in annelids (e.g., earthworms).
- **Function**: Parapodia are used for locomotion and respiration, but they are not present in protozoans.

### Conclusion
After analyzing all the options, we find that:
- Pseudopodia, cilia, and flagella are all locomotory organelles found in protozoans.
- Parapodia, however, are not found in protozoans; they are found in annelids.

Thus, the answer to the question "Which of the following is not a locomotory organelle of protozoans?" is **Parapodia**.

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