Life cycle of a flowering completes in the following stages;
1/. Development of gametophyte. I.e female gametophyte( egg+ 2n nucleus) and male gametophyte( tube nucleus and generative nucleus which then form 2 sperms).
2/. Fertilization :: during fertilization egg+ 1 sperm combines results in zygote.
Egg + Sperm = zygote
3/. Seed and fruit::
After fertilization the ovule is said to be seed and ovary is said to be fruit.
4 /. Germination::
When seed is kept in a favourable condition then germination occurs and a new plant is came into being.
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