Question

what is double fertilisation in flowering plants?​

Answer 1

Answer:

Of the two sperm cells, one sperm fertilizes the egg cell, forming a diploid zygote; the other sperm fuses with the two polar nuclei, forming a triploid cell that develops into the endosperm. Together, these two fertilization events in angiosperms are known as double fertilization.

Explanation:

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.