Name the common function that cotyledons and nucellus perform.

Explanation

**Step-by-Step Solution:**

1. **Understanding Cotyledons and Nucellus**:
- Cotyledons are the first leaves that develop from the seed and are often referred to as seed leaves. They are located on the outside of the seed and play a crucial role in the early stages of plant growth.
- Nucellus is the central part of the ovule, which contains the embryo sac and is located inside the ovule. It is involved in the development of the seed.

2. **Identifying Their Functions**:
- The primary function of cotyledons is to serve as a source of reserve food material for the developing embryo. This food is crucial for the initial growth of the plant after germination.
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