Question
What is pollination? Describe cross pollination and self pollination.
Solution
The transfer of pollen grains from anther to stigma is called pollination.
The transfer of pollen from the anther of one flower to the stigma of another flower of a different plant of the same species is called cross pollination. In this case, pollen grains of the same flower do not pollinate its stigma.
In cross pollination, the transfer of pollen grains may take place through some agency like wind, insect, bird, water, mammals etc.
Transfer of pollen from the anther of a flower to the stigma of the same flower or a flower on the same plant is called self pollination.

Fig. Germination of pollen on stigma
The transfer of pollen from the anther of one flower to the stigma of another flower of a different plant of the same species is called cross pollination. In this case, pollen grains of the same flower do not pollinate its stigma.
In cross pollination, the transfer of pollen grains may take place through some agency like wind, insect, bird, water, mammals etc.
Transfer of pollen from the anther of a flower to the stigma of the same flower or a flower on the same plant is called self pollination.

Fig. Germination of pollen on stigma