Question

Write the following main events of fertilization in plants in sequence.


Germination of pollen tube , Formation of zygote, Pollination, Penetration of ovule, Development of seed and fruit, Division of generative nucleus into two, Double fertilization

Answer 1

Fertilisation. When a pollen grain lands on the stigma of a flower of the correct species , a pollen tube begins to grow. It grows through the style until it reaches an ovule inside the ovary. The nucleus of the pollen then passes along the pollen tube and fuses (joins) with the nucleus of the ovule.

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Answer 2

Answer:

Sequence of events of sexual reproduction in flowers are:

(1) Pollination- transfer of pollen to stigma.

(2) Fertilization- 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 many time by mitosis and produces embryo.

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