what is pollution give two difference between self pollination and cross pollination with example

Dear student.

I guess, it should be pollination instead of pollution.

Pollination is defined as the process of transfer of pollen grains from the anther to the stigma for the purpose of fertilization in plants.  

Please refer the link below:

https://www.meritnation.com/ask-answer/question/explain-the-difference-between-self-pollination-and-cross/reproduction-in-plants/6290664 

Regards.