Question

explain double fertilisation process in plants

Answer 1

Double fertilization : It occurs when one male nucleus fertilizes (fuses) with egg cell to form zygote cell and other male nucleus fuses (fertilizes) with two polar nuclei to cause triple fusion. As these two types of fertilizations take place at the same time in the ovule of the plant, it is known as double fertilization.

After fertilization:

(i) Ovary develops into fruit.

(ii) Ovules develop into seeds.

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Answer 2

In plants,a pollen tube carries two pollen grains. One of them fuses with the egg cell to produce a zygote and the another one fuses with the secondary nucleus to produce triploid primary endosperm nucleus.

PEN nourishes the developing embryo. This event is known as double fertilization.

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