Question

write briefly about the post fertilisation changes in step by step
1. Endosperm
2. Embryo
3. Seed
pls urgent fast!!!!!!​

Answer 1

Answer:

In angiosperms, double fertilization takes place; one male gamete fuses with the egg cell to form the zygote and another male gamete fuses with the polar nuclei to form the endosperm. Various changes take place after fertilization. These include endosperm and embryo development, maturation of the ovules to form seeds and maturation of the ovary to give rise to a fruit. The zygote divides to give rise to two cells called as the terminal cell and basal cell.  The basal cell divides to form the suspensor which is a linear group of cells. The terminal cell divides to form the embryo. These embryo cells are further divided to form the different stages in the development phase. The first stage is the globular stage, followed by heart stage and finally the torpedo stage. This embryo develops and matures inside the seed. 



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Answer 2

Explanation:

1.) The endosperm is a tissue produced inside the seeds of most of the flowering plants following fertilization. It is triploid in most species. It surrounds the embryo and provides nutrition in the form of starch, though it can also contain oils and protein. This can make endosperm a source of nutrition in animal diet.

2.) It possesses two haploid nuclei and six haploid cells which do not have cell walls. In some cases, the haploid nuclei combine forming a single cell (endosperm motor cell). At the event of fertilisation, one male nucleus and egg nucleus combine for the formation of zygote leading to the development of the embryo.

3.) Fertilization occurs when one of the sperm cells fuses with the egg inside of an ovule. After fertilization occurs, each ovule develops into a seed. Each seed contains a tiny, undeveloped plant called an embryo. The ovary surrounding the ovules develops into a fruit that contains one or more seeds.