Question

9. How do plants avoid self-pollination (mark all that apply).

a. Some plants are diecious

b. Some plants spatially separate male and female flowers

c. Some plants are able to genetically recoginize pollen from the same species and prevent pollen tube growth

d. Some plants use temporal separation for the timing of the blooming of male and female flowers

e. Some plants rely on water for fertilization

Answer 1

Ans) Options A,B,C and D are correct.

Explanation:

When pollens from anther of a flower pollinate stigma of the same flower or different flower on the same plant, then it is called self pollination.

Certain plants adopt some mechanisms to avoid self pollination which are as follows:

• Dioecism: Dioecious plants are those which have different male and female plants and so avoid self pollination.
• Spatial separation of male and female flowers to avoid self pollination.
• Self incompatibility: When pollens fall on the stigma of the same flower but pollination does not occur.
• Dichogamy: Male and female flowers bloom at separate times so as to avoid self pollination.

So, option A,B,C and D are correct regarding self pollination.