In a pollen grain, larger nucleus is
Generative nucleus
Tube nucleus
Vegetative nucleus
None of these
(b)Tube has a large nucleus which is surrounded by thin sheath of cytoplasm.
Pollen grains can be stored for several years in liquid nitrogen having a temperature of
The function of endothecium is
$A$ : Formation of mature male gametophyte requires one meiotic and one mitotic division in $60\;\% $ of the angiosperms. $R$ : Pollination occurs in three celled condition in majority of angiosperms.
Members of which plant family, pollen grains maintain viability for months ?
Microspore tetrads forms due to meiotic division occurs in……
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