Answers

2015-10-26T20:59:12+05:30
I'm sorry I can only explain you sexual reproduction in flowers
Sexual reproduction in plants is happens by the process of Pollination
Androecium the male part of the flower has pollen grains in Anther
Gynoecium the female part of the flower has three parts - stigma, style, and ovary & ovary has nucleus
When the pollen grains of the male part of the flower gets transfer to the stigma of the female part of the flower through winds of air,etc it goes gradually down till it goes to the the ovary
When it reaches to the ovary of the gynoecium it splits its nucleus & thus reproduction takes placesĀ 
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