Question

Describe double fertilisation in plants.

Answer 1

Answer:

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.

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Answer 2

༊*·˚Double Fertilisation in plants :-

• The process of fusion of male gamete  with the female gamete to form the  diploid zygote (2n) is known as  fertilisation.

• The fusion of one male gamete with egg  and that of another male gamete with a  secondary nucleus is called double  fertilisation.

• It is the characteristic feature of only  angiosperms.

• All angiosperms are characterised by a  unique process called double fertilisation.

• Double fertilisation is significant because  it involves the use of both the male  gametes produced by a pollen grain.

• This avoids the chances of polyembryony  and increases the chances of survival of the future plant.

• It consists of two fusions and results in  the formation of two products.

• First fertilisation restores diploidy in the  life cycle.

• The diploid zygote develops into an  embryo which subsequently develops  into a new plant.

• Second fertilisation product, triploid PEN  (Primary endosperm nucleus) develops  to form a nutritive tissue called  endosperm for developing an embryo.