Question

how are fruits formed

Answer 1

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when the egg in the stigma of the plant is fertilized at that time after sometime all the stigma style ovary and other flowering things of plants like petals shed off by drying and after that time the 100 modified into seed and the stickers modified into fruit and this is how after the fertilization fruit is formed.

Answer 2

A Fruit is formed through various stages. 
First pollination(which is the transfer of pollen grains from the anther to the stigma) occurs, there is fertilization(the process by which a haploid egg fuses with a haploid male cell gamete to form a diploid zygote) the ovules develop into seeds whereas the ovary ripens and it's walls(polycarp) becomes fleshy hence a fruit is formed.