Question

Define double fertilization , Triple fertilization ? (5 mark)

Answer 1

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.

The phenomenon is unique to angiosperms and is called double fertilization. ... The other male gamete moves towards the two polar nuclei located in the central cell and fuses with them to produce triploid endosperm nucleus.As this involves the fusion of three haploid nuclei, it is termed as triple fusion.
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Answer 2

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When a pollen grain fuse with two polar nuclei. [Polar nuclei are present in the ovule of ovary.] Then triple fission takes place.

And when pollen grain fuse with an egg then formation of Zygote takes place.

Since the fertilization occurs two times, this is known as Double Fertilization in Plants.

Fertilization in Plants is known as the Syngamy.