Select the incorrect from the following.

Options

A. Diatomaceous earth ' is from by the cell wall of diatoms.
B. Viriods consists of protein coat .
C. Phycomycetes are also called algal fungi .
D. Golden algae are also called desmids .

Answer

To solve the question, we need to analyze the four statements provided and identify which one is incorrect.

### Step-by-Step Solution:

1. **Statement Analysis**:
- **Statement 1**: "Diatomaceous earth is formed by the cell wall of diatoms."
- This statement is correct. Diatoms are indeed a type of algae whose silica-rich cell walls accumulate over time to form diatomaceous earth.

- **Statement 2**: "Viroids consist of protein coat."
- This statement is incorrect. Viroids are small infectious agents that consist solely of a short strand of circular RNA and do not have a protein coat. This is the incorrect statement we are looking for.

- **Statement 3**: "Phycomycetes are also called Algal Fungi."
- This statement is correct. Phycomycetes, which include organisms like Rhizopus and Mucor, are indeed referred to as algal fungi due to their similarities with algae.

- **Statement 4**: "Golden algae are also called Desmids."
- This statement is correct. Golden algae, which belong to the group of protists, are often referred to as desmids.

2. **Conclusion**:
- The incorrect statement among the four provided is Statement 2: "Viroids consist of protein coat."

### Final Answer:
The incorrect statement is: **"Viroids consist of protein coat."**

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