Question

The advantage of cross fertilisation in plants is

Briefly discuss any two methods by which plants avoid self – pollination.

Answer the following questions.

Select the statements that are true for outbreeding devices in the flowering plants. (i) They discourage cross-pollination and ensure self-pollination. (ii) They are advantageous as they lead to inbreeding depression. (iii) Self-incompatibility prevents self-pollen from fertilising the ovules. (iv) To prevent self-pollination in some species pollen release and stigma receptivity are not synchronised. Choose the correct answer :