Question

Explain any four devices that flowering plants have developed to encourage cross-pollination.

Hint:

Cross-pollination ensures genetic diversity, which is essential for plant adaptability and evolution.

Answer 1

Flowering plants employ several strategies to promote cross-pollination: Dichogamy: This involves a time-based separation, where male and female reproductive parts mature at different times (e.g., protandry in sunflowers, where anthers mature before the stigma). Self-incompatibility: A genetic system that inhibits the germination of pollen from the same plant (e.g., observed in Brassica). Herkogamy: Physical separation of reproductive organs within a flower to prevent self-pollination (e.g., the arrangement of stamens and pistil in hibiscus). Monoecy and Dioecy: These refer to the arrangement of reproductive organs, with monoecious plants having separate male and female flowers on the same individual (e.g., maize), and dioecious plants having male and female flowers on distinct individuals (e.g., papaya).