why flowering plants undergo double fertilization? explain the process of stages from pollination to formation of endosperm
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Answer:
After pollen is deposited on the stigma, it must germinate and grow through the style to reach the ovule. ... Of the two sperm cells, one sperm fertilizes the egg cell, forming a diploid zygote; the other sperm fuses with the two polar nuclei, forming a triploid cell that develops into the endosperm.
Explanation:
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Here is your answer ---->
- Angiosperms undergo the process of double fertilization.
- Double fertilization involves two sperm cells; one fertilizes the egg cell to form the zygote, while the other fuses with the two polar nuclei that form the endosperm. After fertilization, the fertilized ovule forms the seed while the tissues of the ovary become the fruit.
Detailed process of double fertilization --->
Pollination is the process of transfer of pollen grains from the anther to stigma.
i. When the pollen grains fall on the stigma, the pollen tube enters one of the synergids and releases two male gametes.
ii. One of the male gametes moves towards the egg cell and fuses with it to form a zygote.
iii. The other male gamete fuses with the two polar nuclei and forms the primary endosperm nucleus. This is termed as triple fusion.
iv. After the triple fusion, the central cell becomes the primary endosperm cell (PEC). The primary endosperm nucleus gives rise to endosperm, while the zygote develops into an embryo.
v. Seeds are the fertilized ovules that are developed inside a fruit.
vi. The integuments of ovules harden to form the seed coat, and the micropyle facilitates the entry of oxygen and water into the seed.
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