First slide
Pre-fertilisation : Structures and Events
Question

Which of the following strategies is the only type of pollination that can bring genetically different types of pollen grains on the stigma?

Easy
Solution

Xenogamy is cross-pollination. In this case transfer of pollen grains from anther to the stigma of a different plant takes place.
Geitonogamy involves the same plant. It is genetically self-pollination.
Autogamy is self-pollination. 
Cleistogamy is also autogamy.

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