Both nucellus and endosperm have abundant reserve food materials. How is their food reservoir utilised in angiosperms ?

Explanation

**Step-by-Step Solution:**

1. **Understanding Nucellus and Endosperm:**
- The nucellus is a tissue within the ovule that contains the female gametes. It serves as a food reserve for the developing embryo.
- The endosperm is a tissue formed after fertilization that provides nutrition to the developing embryo. It is a result of double fertilization, where one sperm fertilizes the egg to form the zygote (embryo), and the other sperm fuses with two polar nuclei to form the endosperm.

2. **Formation of the Seed:**
- In angiosperms, seeds are formed as a result of double fertilization. This process leads to the formation of both the zygote (which develops into the embryo) and the endosperm (which serves as a food source).
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