What are the plastids? Discuss three types of plastids with their functions.

Explanation

### Step-by-Step Solution:

**Step 1: Definition of Plastids**
Plastids are double membrane-bound organelles found in plant cells. They are essential for various functions, including storage and photosynthesis.

**Step 2: Types of Plastids**
There are three main types of plastids:
1. **Leucoplasts**
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