Give scientific terms for the following:
A food-laden tissue differentiated inside the embryo sac after double fertilisation from the primary endosperm nucleus.

Explanation

**Step-by-Step Solution:**

1. **Understanding Double Fertilization**: In flowering plants (angiosperms), double fertilization is a unique process where two fertilization events occur. One male gamete fuses with the female gamete to form the zygote, while the other male gamete fuses with the central cell.

2. **Identifying the Central Cell**: The central cell contains two polar nuclei. When the second male gamete fuses with this central cell, it forms a triploid cell known as the primary endosperm nucleus.

3. **Formation of Endosperm**: The primary endosperm nucleus undergoes mitotic divisions to develop into a tissue that provides nourishment to the developing embryo.

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