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Answer:
1. The fusion of the male and female gametes during fertilization is named syngamy. The fusion of the sperm cell with the two polar nuclei during double fertilization is called triple fusion. Syngamy is a generative fertilization.
2. Complete answer: The primary endosperm nucleus is the nucleus formed by the fusion of two polar nuclei in the embryo sac of an angiosperm plant before fertilisation. Oenothera is a herbaceous flowering plant. In the endosperm, the central egg cell has n chromosomes contributed by the mother
3.Endosperm is triploid (3n) in most of the angiospermic plant as two polar nuclei fuse with a male gamete and three of them are haploid. But the number varies from 2n to 15n in different species.
4. Double fertilization is a complex fertilization mechanism of flowering plants. This process involves the joining of a female gametophyte with two male gametes. It begins when a pollen grain adheres to the stigma of the carpel, the female reproductive structure of a flower.
Explanation:
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