List three strategies of bisexual chasmogamous flower can evolve to prevent self-pollination (autogamy).

(a) Mention any four strategies adopted by flowering plants to prevent self- pollination. (b) Why is geitonogamy also referred to as genetical autogamy?

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

Autogamy can occur in a chasmogamous flower if :

What are the advantages of autogamy or self pollination ?

What is meant by speciation? List four factors that could lead to speciation. Which of these cannot be a major factor in the speciation of a self-pollinating plant species. Give reason to justify your answer.

Which of the following statement(s) is/are true about self-incompatibility? (i) It is a device to prevent inbreeding. (ii) It provides a biochemical block to self-fertilization. (iii) It ensures cross-fertilization (iv) It is governed by pollen-pistil interaction. (v) It is governed by series of multiple alleles. (vi) It prevents self-pollen (from the same flower of other flowers of the same plant) from fertilizing the ovules by inhibiting pollen germination of pollen tube growth in the pistil.