How is cross pollen different from self pollen?

its flower blooming ploin

Microscopic differences in shape and size.

What is pollen? Plants produce microscopic round or oval pollen grains to reproduce. In some species, the plant uses the pollen from its own flowers to fertilize itself. Other types must be...

pollen comes from the stamen in the flower.

Pollen grains are the vessels to transport the male gamete to the female ovary for fertilization. Pollen is light, it can float is water or be transported by insects, birds, animals and the wind