Question

Which of the following is the correct sequence of events of sexual reproduction in a flower?

• A. pollination, fertilisation, seedling, embryo
• B. seedling, embryo, fertilisation, pollination
• C. pollination, fertilisation, embryo, seedling
• D. embryo, seedling, pollination, fertilisation

Answer 1

The correct option is D)

The sequence of events of sexual reproduction in flowers are:

(1) Pollination- transfer of pollen to the stigma.

(2) Fertilization- a fusion of male gamete and egg cell produce zygote and fusion of polar nuclei with male gamete produce triploid endosperm.

(3) Embryo formation- zygote divides much time by mitosis and produces embryo.

(4) Seedling- embryo differentiates and becomes plumule, radicle, and one or two cotyledons. Endosperm divides by mitosis to produce endosperm tissue which is a food store. Integuments surrounding the embryo sac forms testa (seed coat).