Explain the difference between self-pollination and cross-pollination.

Self-pollination

Cross-pollination

It involves the transfer of pollen from the stamen to the pistil of the same flower.

It involves the transfer of pollen from the stamen of one flower to the pistil of another flower of the same plant or that of a different plant of the same kind.

It occurs only in bisexual flowers.

It occurs in both unisexual and bisexual flowers.