Question

(i) Explain the development of male gametophyte in an angiosperm. (ii) Draw a labelled diagram of a three-celled male gametophyte. OR (i) Draw a…

Accepted Answer

(a) (i) Each microspore mother cell in sporogenous tissue undergoes meiosis, forming microspores tetrad by the process called microsporogenesis, microspores form cluster of four cells called microspore tetrad, as the anther matures and dehydrates, each microspore undergo assymetric division to produce a vegetative cell and a generative cell. (ii) OR (b) (i) (ii) At embryonic stage (iii) Both LH and FSH attain a peak level in mid of menstrual cycle rapid secretion of LH leading to maximum level is called LH surge, which induces rupture of graffian follicle and cause ovulation, ovulatory phase is followed by luteal phase during which remaining parts of graffian follicle transform as corpus luteum, it produces large amount of progesterone needed for maintaining endometrium, in absence of fertilization corpus luteum degenerates which causes disintegration of the endometrium leading to menstruation.

(i)
Explain the development of male gametophyte in an angiosperm.
(ii)
Draw a labelled diagram of a three-celled male gametophyte.

Marking-scheme solution

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