Xenogamy or cross-pollination is performed by
$I$. Abiotic agencies
$II$. Biotic agencies
$III$. Insects only
Select the correct option for the given question
$I$ and $III$
$II$ and $III$
Only $III$
$I$ and $II$
Autogamy means....
Contrivances for self pollination are
Geitonogamy involves
Ornithophily refers to the pollination by which of the following?