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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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53.

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

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

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

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59. Give the characters of wind pollinated flowers

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

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