Which one of the following is an example of cleistogamy?
Sunflower
Vallisneria
Commelina
Calotropis
Xenogamy or cross-pollination is performed by
$I$. Abiotic agencies
$II$. Biotic agencies
$III$. Insects only
Select the correct option for the given question
What is pollination ? Describe its types.
Which one of the following pollinations is autogamous?
Feathery stigma and versatile anthers are characteristic of