Unisexuality of flowers prevents
(1) Autogamy and geitonogamy
(2) Autogamy, but not geitonogamy
(3) Both geitonogamy and xenogamy
(4) Geitonogamy, but not xenogamy
Sol. Answer (2)
Autogamy but not geitnogamy : Unisexuality promotes or favours the cross pollination
(xenogamy) and prevent self pollination (Autogamy). Geitnogamy involve transfer of
pollen grain between two flowers of the same plant so unisexuality will not prevent
geitnogamy.