Diatoms perform which type of movement in water :-

Options

A. Swimming
B. Amoeboid
C. Floating
D. Ciliary

Answer

**Step-by-Step Solution:**

1. **Understanding Diatoms**: Diatoms are a type of phytoplankton, which are microscopic organisms that live in aquatic environments. They are known for their unique silica cell walls and play a crucial role in aquatic ecosystems.

2. **Types of Movement**: The question asks about the type of movement diatoms perform in water. The options given are swimming, immovoid, floating, or ciliary.

3. **Analyzing the Options**:
- **Swimming**: This implies active movement through the water, which diatoms do not perform.
- **Immovoid**: This suggests a lack of movement, which is not accurate for diatoms as they can move.
- **Floating**: This indicates that diatoms remain suspended in the water column, which is characteristic of their behavior.
- **Ciliary**: This suggests movement using cilia, which diatoms do not have.

4. **Correct Answer**: Diatoms primarily perform a floating movement. They are buoyant due to the oil and lipids they store, which have a lower density than seawater. This allows them to float and remain suspended in the water.

5. **Conclusion**: Therefore, the correct answer to the question is that diatoms perform floating movement in water.