Question

Event between pollination and fertilization formation of zygote in embryo sac more than 500words

Answer 1

ANSWER

Pollination is a process of transferring of pollens From one flower to another.

While fertilization is the process after the successful transfer of pollination, which involves the fusion of male gametes and female gametes of plants. Both of these are the natural process. But only flowering plants undergo the process of pollination, while fertilization is the common process of almost all living being.

In this process flowering plants reproduce by combining egg cells and sperm cells, to form zygote. This zygote matures into the seeds and grow the next generation. Female egg cells are present in the ovary while male sperm present in the pollen grains.

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Answer 2

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Pollination:

➟It is the transfer of pollen grains from the anther to the stigma of a flower.

➟ It leads to fertilization.

➟It is an external process.

Fertilization:

➟It is the fusion of male gamete with female gamete

➟It results in the formation of seeds.

➟ It is an internal process

Sequence of development during the formation of embryo sac:

Archesporial cell --->Megaspore mother cell --->Megaspore --->Embryosac

The archesporial cell is a part of megasporangium and it divides to give rise to megaspore mother cell. A diploid megaspore mother cell is formed and it undergoes meiosis and gives rise to haploid megaspore cell which then develops into haploid female gametophyte i.e. embryosac.

Formation of embryo sac:

➙Megasporogenesis is the process of formation of haploid megaspores from diploid megaspore mother cell by meiosis.

➙Megagametogenesis is the process of formation of embryo sac from the functional haploid megaspore.

➙Microgametogenesis is the process of formation of pollen grains from the microspores.

Double fertilization:

Double fertilization is a complex mechanism found in the flowering plants. This process involves the joining of female gametophyte with two male gametes . In this, triploid endosperm and a diploid zygote is formed. In this case, syngamy between male and female gametes produce the embryo. At the same time, the secondary nuclei which is diploid in nature will fuse with another male gamete and forms the endosperm. It was first discovered by Nawaschin.

The formation of embryo sac is called :

The nucleus of megaspore undergoes divisions and give rise to embryo sac or female gametophyte, which is called megagametogenesis.

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