Maturation of male and female sex organs at different times in a flower is called

Which of the following flowers show heterostyly?

Match the following columns regarding plant breeding systems and select the correct option:
Column-$I$: $(i)$ Monoecious,(ii) Dioecious
Column-$II$: $(p)$ Prevents both autogamy and geitonogamy,$(q)$ Prevents autogamy but not geitonogamy
Column-$III$: $(x)$ Papaya and Date palm,$(y)$ Castor and Maize

The maturation of male (anthers) and female (stigma) reproductive structures at different times in the same flower (in order to reduce the possibility of self-pollination) is called:

Match the following contrivances from Column-$I$ with their examples in Column-$II$.

Column-$I$	Column-$II$
$i$. Protandry	$a$. Calotropis
$ii$. Prepotency	$b$. Tobacco
$iii$. Self sterility	$c$. Sunflower
$iv$. Herkogamy	$d$. Apple

In which of the following plants are both geitonogamy and autogamy prevented?