73.Banana is a parthenocarpic fruit whereas oranges show polyembryony. How are they different from each other with respect to seeds ?
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74.
What are the various adaptations in angiospermic flowers which favour cross-pollination ? Or Explain adaptations by which autogamy is prevented in flowering plants.
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75.
With a neat labelled diagram, describe the parts of a typical angiosperm ovule.
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76.Draw a longitudinal section of a post-pollinated pistil showing entry of pollen tube into a mature embryo sac. Label filiform apparatus, chalazal end, hilum, antipodals, male gametes and secondary nucleus
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77. Describe the structure of a typical monosporic embryo sac found in flowering plant.
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78.What do you mean by development of embryo? Support the answer with diagram.
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79.
Describe apomixis , parthenocarpy and polyembryony
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80.Explain the germination of pollen grain with the help of a diagram.
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