Mention the reasons for difference in ploidy of zygote and primary endosperm nucleus in an angiosperm.

Explanation

### Step-by-Step Solution:

1. **Understanding Ploidy**:
- Ploidy refers to the number of sets of chromosomes in a cell. In angiosperms, the zygote and the primary endosperm nucleus have different ploidy levels.

2. **Formation of the Zygote**:
- The zygote is formed through the process of syngamy, which involves the fusion of two haploid gametes: the haploid egg cell (female gamete) and the haploid male gamete (sperm).
- Since both gametes are haploid (n), their fusion results in a diploid (2n) zygote.
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