Question

Double fertilisation involves

• A. Fertilisation of the egg and the central cell by two sperms brought by different pollen tubes
• B. Fertilisation of two eggs in the same embryo sac by two sperms brought by one pollen tube,
• C. Fertilisation of the egg by two male gametes
• D. Fertilisation of the egg and the central cell by two sperms brought by the same pollen tube.

Answer 1

The correct option is D Fertilisation of the egg and the central cell by two sperms brought by the same pollen tube.

Fertilisation in angiosperms is called double fertilisation due to following two fusion events:

• One of the two male gametes released by a pollen tube fertilises the egg to produce a diploid zygote.
• It divides and produces the embryo.
• Second male gamete or sperm released by the same pollen tube fertilises the diploid central cell of the embryo sac to produce a triploid primary endosperm cell containing primary endosperm nucleus $\left(PEN\right)$.
• It divides and develops into the endosperm.