Both,autogamy and geitonogamy are prevented in

What is the outbreeding device,where the stamens and carpels mature at different times called?

Which of the following mechanisms prevents self-pollination?

Self-pollination results in:

$A$ dioecious flowering plant prevents both

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