Question

the reproductive parts of angiosperms are located in the flower . state the changes that take place in the flower after the germinated pollens reach the ovules

Answer 1

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♦ After pollination (transfer of pollen grain from anther of stamen to stigma of pistil/carpel), pollen grains give rise to pollen tubes.

♦ Each pollen tube carries two male gametes which travels through the style and finally reach the ovary.

♦ The ovary contains ovules. The gametes enter into the ovules.

♦ Each ovule has an egg cell.

♦ The process of fusion of male and female gametes is called fertilisation.

♦ In the process of fertilisation, one male gamete fuses with the egg to form diploid zygote.

This process is called syngamy.

♦ The other male gamete fuses with two polar nuclei to form triploid primary endosperm nucleus.

This process is called triple fusion.

♦ The process of syngamy and triple fusion take place in embryo sac of the ovule.

♦ These two fusions are together known as double fertilisation.

♦ After fertilisation, zygote develops into embryo.

♦ Primary endosperm nucleus develops into endosperm.

Endosperm provides nutrition to developing embryo.

♦ Ovule changes to seed.

♦ Ovary changes to fruit.

♦ Petals and sepals fall off.


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