Flowers produce foul odors to attract which of the following pollinators?

Large,colourful,fragrant flowers with nectar are seen in

Which term is used for the transfer of pollen grains from the anther of one plant to the stigma of a different plant,where genetically different types of pollen grains are brought to the stigma during pollination?

The process where pollen grains from a flower reach the stigma of a flower on a different plant is called:

What is the advantage of cleistogamy?

Definitions / Explanation:
$1.$ Geitonogamy
$2.$ Coleorrhiza