In an angiosperm the embryo sac is haploid , zygote is diploid and endosperm is triploid. Justify giving reasons for each stage.

Explanation

### Step-by-Step Solution:

1. **Embryo Sac is Haploid**:
- The embryo sac in angiosperms is formed from a haploid megaspore mother cell through a process called meiosis.
- During meiosis, the diploid (2N) megaspore mother cell undergoes reduction division, resulting in four haploid (N) megaspores.
- Typically, one of these megaspores survives and develops into the embryo sac, which is thus haploid.

2. **Zygote is Diploid**:
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