(a) Explain the terms 'self pollination' and 'cross-pollination'?(b) How do the insects help in cross-pollination?(c) How is the process of pollination different from fertilization?

(a) Self-Pollination - This types of pollination occur when the pollen of one flower transfers to the stigma of the same flower, or another flower of the same plant.

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Cross-Pollination - This types of pollination occurs when the pollen of one flower transfers to the stigma of another flower of different plants of the same species.

 "[Image is posted for extra information and better understanding only]" 

(b) When an insect sits on a flower, the pollens from the anther stick to their wings and limbs. The same insect when sits on another flower, the pollens from its body get transferred to the stigma of that flower thereby affecting pollination.

(c) Pollination is the transfer of male gametes onto the female gametes, while fertilisation is the fusion of these two gametes.