Which of the following features is not possessed by diatoms ?

Options

A. Movement is brought about by mucilage propulsion
B. Serve as sewage pollution indicators
C. Male gemete grows into a rejuvenscent cell called auxospore
D. Body is called frustule

Answer

To determine which feature is not possessed by diatoms, we will analyze each of the given options based on our understanding of diatom characteristics.

**Step 1: Understand what diatoms are.**
- Diatoms are unicellular algae that have a unique silica cell wall known as a frustule. They are known for their photosynthetic ability and play a significant role in aquatic ecosystems.

**Step 2: Evaluate the options provided.**
1. **Movement is brought about by mucilage propulsion.**
- Diatoms do not have a typical mode of movement like many other organisms. They do not move using mucilage propulsion; instead, they are mostly non-motile and rely on water currents for movement.

2. **Served as sewage pollution indicator.**
- Diatoms can serve as indicators of water quality and pollution levels, including sewage pollution. This statement is true.

3. **Male gamete grows into the rejuvenation cell called auxospore.**
- Auxospores are indeed specialized cells in diatoms that help them regain size after mitotic division. This statement is also true.

4. **Body is called the frustule.**
- The body of diatoms is indeed referred to as the frustule, which is made of silica. This statement is true.

**Step 3: Identify the incorrect feature.**
- From the analysis, the first option, "movement is brought about by mucilage propulsion," is the feature that is not possessed by diatoms.

**Final Answer:**
The feature that is not possessed by diatoms is **movement is brought about by mucilage propulsion.**

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