Question

fertilization in plants

pls send me a answer ​

Answer 1

‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ $\large{\underline{\textsf{Fertilization In Plants }}}$

• Pollen grains reach the right stigma and begin to germinate.
• Pollen grain forms a small tube-like structure called pollen tube which emerges through the germ pore. The contents of the pollen grain move into the tube.
• Pollen tube grows through the tissues of the stigma and style and finally reaches the ovule through the micropyle.
• Vegetative cell degenerates and the generative cell divides to form two sperms (or male gametes).
• Tip of pollen tube bursts and the two sperms enter the embryo sac.
• One sperm fuses with the egg (syngamy) and forms a diploid zygote. The other sperm fuses with the secondary nucleus (Triple fusion) to form the primary endosperm nucleus which is triploid in nature. Since two types of fusion syngamy and triple fusion take place in an embryo sac the process is termed as double fertilization.
• After triple fusion, primary endosperm nucleus develops into an endosperm.
• Endosperm provides food to the developing embryo.
• Later the synergids and antipodal cells degenerate.

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Answer 2

CONCEPT:- FERTILIZATION IN PLANTS

Most of the higher plants reproduce sexually. Sexual reproduction in flowering plants involves the process called as fertilization. Flower is the reproductive organ of plants which produces the gametes. The fusion of the male and the female gametes produced by the flower is called fertilization. During pollination, a large number of pollen grains are deposited on the stigma of a flower. These pollen grains starts to germinate and forms a pollen tube downwards to the ovary. The male gamete within the pollen grain reaches the ovary through pollen tube and fuses with the female gamete to form the zygote. The zygote later on develops into an embryo which in turn develops into a young plant.$\:$

Here are the definitions for the highlighted words!

• Gametes - They are the sex cells, which are being the necessary biological structure in sexual reproduction, that carries a single type of chromosome.
• Pollination - The transfer of pollen grains from the male anther of a flower to the female stigma is termed as pollination.
• Pollen grains - They are the minuscule biological structures which contains the male gametes.
• Stigma - It is present at the tip of the pistil and forms the landing platform for pollen grains.
• Pollen tube - It is the duct which transfer the male gametes from the pollen grains to the ovule.
• Ovary - It is the main reproductive organ of the flower which encloses the unfertilized female gamete and the fertilized ovule.
• Zygote - It is the fertilized egg cell, which is formed as the union of male and female gametes.
• Embryo - When the zygote goes under cell division repeatedly, it forms the embryo which develops into an eukaryote.

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