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Sexual Reproduction in flowering Plants

Long Answer Type

51. What are chasmogamous flowers ? Can cross pollination occur in cleistogamous flowers ? Give reasons for your answer.

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

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Short Answer Type

53.

What is self-incompatibility? Why does self-pollination not lead to seed formation in self-incompatible species?

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Long Answer Type

54. What is triple fusion ? Where and how does it take place ? Name the nuclei involved in triple fusion.

Triple fusion. It is the fusion of two polar nuclei of embryo sac with one male gamete. It is named triple fusion because three nuclei i.e two polar nuclei and one male nuclei fuse together to form a 3n cell.

It occurs in embryo sac. Triple fusion occurs when during fertilization the other male nuclei moves towards the central two polar nuclei and fuse with them forming 3n primary endosperm nucleus.

Nuclei involved are two polar nuclei and one nucleus of male gamete.

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