Question

what is double fertilization ? describe fertilizated embrysac with a neat labelled diagram​

Answer 1

Explanation:

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.

Double fertilization is a complex fertilization mechanism of flowering plants (angiosperms). This process involves the joining of a female gametophyte (megagametophyte, also called the embryo sac) with two male gametes (sperm). ... The pollen tube proceeds to release the two sperm in the megagametophyte

Answer 2

two male gametes, one unites with the egg of female and the other unites with the secondary nucleus of the embryo sac, forming triploid or triple fusion nucleus, called the primary endosperm nucleus. The other male gamete fuses with the egg nucleus causing fertilisation, resulting in the formation of a diploid zygote or diploid oospore. This is called syngamy. The process involving the fusion of haploid nucleus of male gamete with the diploid secondary nucleus to form a triploid primary endosperm nucleus is called triple fusion.

The significance of double fertilisation:

(1) Syngamy results in formation of zygote which gives rise to the embryo

(2) Double fertilisation results in the formation of triploid endosperm which ensures, better nourishment of the developing embryo.

(3) Seeds are viable with a high percentage of germination.

(4) Double fertilisation brings about the recombination of characters.

solution