The thin and continuous wall layer of pollen is
Exine
Intine
Germ pore
Endothecium
$A$ : 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.
Mention about the viability of pollen grain.
A typical angiosperm anther is
Approximate diameter of pollen grain is
Haploids can be obtained form