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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 ?

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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

Zoophily: Pollination by animals is called zoophily.
Zoophilous flowers: The flowers which get pollinated with the aid of animals are called zoophilous flowers.

Entomophilous flowers: Flowers which are pollinated by insect are called entomophilous flowers.

Characters of Entomophilous flowers

(1) The flowers are of large size.

(2) Corolla of flowers is brightly coloured to attract insects. Bracts may become bright coloured

(3) If the flowers are small they are grouped together to form inflorescence which helps attracting insects.

(4) They may produce nectar to lure insects.

(5) The pollen grains are heavy with rough and spiny surface so that they stick to the insects body.

(6) The stigma surface is sticky.

(7) the flowers have fragrance to attract insects . some have foul odour to attract insects like flies and beetles.

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