Name some symptoms of viral diseases.

Explanation

### Step-by-Step Solution:

1. **Understanding Viral Diseases**:
- Viral diseases are caused by viruses, which are infectious agents that can infect living organisms, including plants, animals, and humans. They contain genetic material (either DNA or RNA) surrounded by a protein coat called a capsid.

2. **Symptoms in Plants**:
- One of the most well-known viral diseases in plants is caused by the Tobacco Mosaic Virus (TMV). The symptoms of viral infections in plants can include:
- **Mosaic Formation**: This refers to the appearance of mosaic-like patterns on the leaves, which is a result of uneven chlorophyll distribution.
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