Potatoes are generally brown in colour. But, we find some green areas on potatoes. Give reason.

Explanation

### Step-by-Step Solution:

1. **Understanding Potatoes**: Potatoes are not fruits; they are actually a modified part of the plant known as a tuber, which is a type of stem.

2. **Color of Potatoes**: When potatoes are harvested from the soil, they typically have a brown color due to the presence of a type of plastid called leucoplast.

3. **Types of Plastids**: There are two main types of plastids:
- **Leucoplasts**: These are colorless plastids that store carbohydrates, such as starch, and are abundant in potatoes.
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