Question

Describe the process of double fertilization ?​

Answer 1

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DEFINITION :- “Double fertilization is a complex process which involves the fusion of one female gametophyte with two male gametes”

EXPLANATION :

• Angiosperms are flower-bearing plants and are the most diverse group of terrestrial plants. The flowers form the reproductive part of angiosperms with separate male and female reproductive organs.

• Each contains gametes – sperm and egg cells respectively. Pollination helps the pollen grains to reach stigma via style. The two sperm cells enter the ovule-synergid cell. This proceeds to

fertilization.

• In angiosperms, fertilization results in two structures, namely, zygote and endosperm, hence named, double fertilization.

• Double fertilization is a complex process where out of two sperm cells, one fuses with the egg cell and the other fuses with two polar nuclei which result in a diploid (2n) zygote and a triploid (3n) primary endosperm nucleus (PEN) respectively. Since endosperm is a product of the fusion of three haploid nuclei, it is called triple fusion.

• Eventually, the primary endosperm nucleus develops into the primary endosperm cell (PEC) and then into the endosperm.The zygote becomes an embryo after numerous celldivisions.

Answer 2

Answer:

in plants pollen grain consists of two sperms.

in ovoule one sperm fertilize with egg cell to form zygot/embryo and other sperm fertilize with diploid endosperm to form 3n endospermic tissue which nourish the embryo while growing.

this whole phenomenon is termed as double fertilization.