what does a mature pollen grain represent ?
Answers
Answer:
The hard outer layer called the exine is made up of sporopollenin which is one of the most resistant organic material known. ...
Answer:
Stamen is the male reproductive organ that consists of long slender filament and broad knob like anther; each anther lobes of anther contains two long and cylindrical microsporangia. Since, stamen bear microsporangia in anther lobes, they are also called as microsporophylls. Option A is incorrect. Gynoecium represents the megasporophyll as it carries megasporangia, i.e., the ovule, at basal part of pistil. Option B is incorrect. Megaspore represents the first cell of embryo sac/female gametophyte; depending upon the number of megaspores involved in development of female gametophyte, single/two/three successive mitotic division form eight nucleate-seven celled female gametophyte. Option C is incorrect. Pollen grain is the first cell of male gametophyte that divides mitotically to form small generative cell and large tube/vegetative cell. Pollen with small generative and large vegetative or with one vegetative cell and two male gametes is known as mature male gametophyte.