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Pollen Viability

give an examp...

Question

give an example of a plant that produces flowers , that have self incompatibility as an outbreeding device.

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Solution

Primroses, Flax

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Q. Flowering plants have developed certain outbreeding devices to discourage self-pollination and encourage cross-pollination. One of these is not an example of such outbreeding device.

Q. Flowering plants have developed certain outbreeding devices to discourage self-pollination and to encourage cross-pollination. One of the following is not an example of such an outbreeding device.

Q. Which of the following is an outbreeding device?

a. If pollen release and stigma receptivity are not synchronized.

b. If the anther and stigma are placed at different positions so that pollen cannot come in contact with the stigma of the same flower.

c. Self-incompatibility which prevents self-pollen (from the same plant) from fertilizing the ovules by inhibiting pollen germination or pollen tube growth in the pistil.

d. Production of the unisexual flower.

Q. Angiosperm flowers may be monoecious, cleistogamous or may show self-incompatibility. Describe the characteristic features of each one of them and state which one of these flowers promotes inbreeding and outbreeding respectively.

Q. Assertion: Self-incompatibility is a genetic mechanism that prevents self-pollen from the same flower or other flowers of the same plant from fertilizing the ovules by inhibiting pollen germination or pollen tube growth in the pistil.
Reason: In gametophytic self-incompatibility, the incompatibility is determined by the genotype of the sporophytic tissue of the plant from which the pollen is derived.

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