What is indicated by $'A'$ and $'B'$ in the given diagram?
$A$ - Exine, $B$ - Male flower
$A$ - Tube nucleus, $B$ - Exine
$A$ - Stigma, $B$ - Female flower
$A$ - Intine, $B$ - Pollen tube
Pollination in water hyacinth and water lily is brought about by the agency of
Sperm cells of angiosperms differ from the rest of the plant groups like gymnosperms by
Pollination by insect is
Common floral reward provided by plants to pollinator are
$A$ : Geitonogamy helps in maintaining homozygosity and superiority of the race indefinitely.
$R$ : It is functionally, ecologically and genetically cross pollination.