plz can someone explain me step by step formation of female gametophyte in angiosperms
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1- Some meristmatic cells under the epidermis are packed
2- Some cells of tht meristmatic tissue bcm enlarge in Micropylar region and called as archesporial cells..
3- These arcjesporial cells undergo periclinal division and form Primary parietal cells(ppc) and other form sporogenous cells(MMC)..
4- MMC undergo meosis and form linear tetrad..
5- 3 cells of tetrad from micropylar end degenerate and only 1 cell of chalazal end remain functional..i,e, megaspore which is haploid(n)..
6- Megaspore cell undergo 3 succesive free nuclear division(FND) or mitosises forming 4 nuclei at each pole means total 8 nuclei in cell..
7- finally 1 nuclei from each pole comes to centre and form cental nuclei...and now after cytokinesis 7 celled and 8 nucleated female gametophyte(embryo sac) is formed...
2- Some cells of tht meristmatic tissue bcm enlarge in Micropylar region and called as archesporial cells..
3- These arcjesporial cells undergo periclinal division and form Primary parietal cells(ppc) and other form sporogenous cells(MMC)..
4- MMC undergo meosis and form linear tetrad..
5- 3 cells of tetrad from micropylar end degenerate and only 1 cell of chalazal end remain functional..i,e, megaspore which is haploid(n)..
6- Megaspore cell undergo 3 succesive free nuclear division(FND) or mitosises forming 4 nuclei at each pole means total 8 nuclei in cell..
7- finally 1 nuclei from each pole comes to centre and form cental nuclei...and now after cytokinesis 7 celled and 8 nucleated female gametophyte(embryo sac) is formed...
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shubham108:
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