Question

Mention two strategies evolved in flowers to prevent self-pollination in flowers.

Answer 1

1: Self-incompatibility: A condition wherein the pollen is ineffective in fertilizing the same flower or other flowers on the same plant usually due to inhibition of the growth of the pollen tube in the stigma and style, thereby preventing delivery of male gametes to the ovules.

2: Maturation of pistil before that of stamen (protogyny) or maturation of stamen before that of the pistil (protandry) inhibit self-pollination.