$A$ : 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.
$A$ : The generative cell comes to lie freely in the cytoplasm of the tube cell. $R$ : Cellulosic wall around generative cell is dissolved.
Which of the following has proved helpful in preserving pollen as fossils?
How many meiotic divisions are necessary to produce $100$ pollen grains
In some members of which of the following pairs of families, pollen grains retain their viability for months after release ?
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