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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.

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Short Answer Type

55. Why do you think the zygote is dormant for some time in a fertilized ovule ?

Zygote is dormant for some time in a fertilized ovule so that some amount of endosperm is formed zygote before it develop. This is done to ensure that the developing embryo will be provided with nutrition in the growing phase by the endosperm.

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56. Draw a schematic labelled diagram of fertilized embryo sac showing zygote and primary endosperm.

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57. Describe the megaspore development in an angiospermic plant.

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Long Answer Type

58. Tabulate the differences between self-pollination and cross-pollination.

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Short Answer Type

59. Give the characters of wind pollinated flowers

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Long Answer Type

60. What are zoophily, zoophilous flowers and entomophilous flowers ? List the characters of entomophilous flowers

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