A eukaryotic group which causes serious plant diseases comes under

Options

A. Monera
B. Fungi
C. Protista
D. Viruses

Answer

To solve the question "A eukaryotic group which causes serious plant diseases comes under," we will analyze each option provided in the question step by step.

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks for a eukaryotic group responsible for causing serious plant diseases. Eukaryotic organisms have cells with a nucleus and membrane-bound organelles.

2. **Analyzing the Options**:
- **Option A: Monera**:
- Monera includes prokaryotic organisms such as bacteria and archaebacteria. Since the question specifies eukaryotic groups, Monera is not a valid option.
- **Conclusion**: Incorrect option.

- **Option B: Fungi**:
- Fungi are eukaryotic organisms that include yeasts, molds, and mushrooms. They are known to be significant pathogens of plants, causing a wide range of diseases (approximately 85% of plant diseases are caused by fungi).
- **Conclusion**: This option is likely correct.

- **Option C: Protista**:
- Protista consists mainly of unicellular eukaryotes, including protozoans and algae. While some protists can cause diseases, they primarily affect animals and humans, not plants. Therefore, they do not fit the criteria of causing serious plant diseases.
- **Conclusion**: Incorrect option.

- **Option D: Viruses**:
- Viruses are not classified as eukaryotic or prokaryotic organisms. They are acellular and can only replicate inside a host cell. Although they can cause diseases in plants, they do not fit the definition of a eukaryotic group.
- **Conclusion**: Incorrect option.

3. **Final Decision**: Based on the analysis, the only eukaryotic group that causes serious plant diseases is **Fungi**. Therefore, the correct answer is **Option B: Fungi**.