Bamboo species flower only in

$A$: Formation of a mature male gametophyte requires one meiotic and two mitotic divisions in $60\%$ of angiosperms.
$R$: Pollination occurs in a two-celled condition in the majority of angiosperms.

Which one of the following is a monocarpic tree?

$A$ : Continued self-pollination checks inbreeding depression.
$R$ : Pollen release and stigma receptivity are synchronised.

Pollen extract stimulates the formation of fruit in the unpollinated carpel because the extract contains the following hormone:

In which animal do haploid cells divide mitotically to produce gametes?