quick!
2006-12-23 02:07:50 · 5 answers · asked by Anonymous in Science & Mathematics ➔ Biology
A seed is a small embryonic plant enclosed in a covering called the seed coat, usually with some stored food. It is the product of the ripened ovule of gymnosperm and angiosperm plants which occurs after fertilization and some growth with in the motherplant. The formation of the seed completes the process of reproduction in seed plants (started with the development of flowers and pollination), with the embryo developed from the zygote and the seed coat from the integuments of the ovule.
This process starts with double fertilization in angiosperms and it involves the fusion of the egg and sperm nuclei into a zygote. The second part of this process is the fusion of the polar nuclei with a second sperm cell nucleus, thus forming a primary endosperm.
hope it helps..
2006-12-23 02:13:15 · answer #1 · answered by For peace 3 · 0⤊ 0⤋
The egg must be fertilized. First the wind blows or a bug rubs pollen off the anther(male section of the flower). The pollen touches the pistil(female section) and a pollen tube grows down the pistil into the egg chamber called the ovary, the pollen is united with the ovule(egg) and a seed is formed.
Hope this helps.
2006-12-23 12:10:59 · answer #2 · answered by Josh S 2 · 0⤊ 0⤋
To make aseed the egg must fuse with pollen.Pollen contain the male reproductive part which contains two polar nuclei. Polar nuclei fuse with the one male gamete of pollen grain to produce secondary nucleus and another male gamete fuse with the egg to produce the embryo.
2006-12-23 10:24:58 · answer #3 · answered by debdd03 2 · 0⤊ 0⤋
Male gamet brought by pollen tube.
2006-12-23 17:52:25 · answer #4 · answered by moosa 5 · 0⤊ 0⤋
what kind of a seed if plant then pollen grain and if animal then sperm
2006-12-23 10:13:37 · answer #5 · answered by Anonymous · 0⤊ 0⤋