Both, autogamy and geitonogamy are prevented in
papaya
cucumber
castor
maize.
Dioecious condition prevents
In papaya male and female flowers are present on different plants. It permits
The devices to discourage self pollination are
Mention two strategies evolved to prevent self-pollination in flowers.
$A$ : Continued self-pollination checks inbreeding depression.
$R$ : Pollen release and stigma receptivity are synchronised.