Banana is a parthenocarpic fruit whereas oranges show polyembryon

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 Multiple Choice QuestionsShort Answer Type

71. Name all the haploid cells present in an unfertilized mature embryo sac of a flowering plant. Write the total number of cells in it.
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 Multiple Choice QuestionsLong Answer Type

72.

Draw labelled structures of some selected seeds.

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73. Banana is a parthenocarpic fruit whereas oranges show polyembryony. How are they different from each other with respect to seeds ?


Banana is a parthenocarpic fruit formed without fertilization It is seedless fruit. 
Where as  orange, is formed due to polyembryony in which  nucellus cells surrounding the embryo sac start dividing to protrude into the embryo sac and develop into embryo. It has more than one embryo in seed.

Banana is different from orange with respect to seeds in a such a way that banana is seedless whereas orange has seeds.
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 Multiple Choice QuestionsLong Answer Type

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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 Multiple Choice QuestionsShort Answer Type

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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 Multiple Choice QuestionsLong Answer Type

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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 Multiple Choice QuestionsShort Answer Type

79.

Describe apomixis , parthenocarpy and polyembryony

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 Multiple Choice QuestionsLong Answer Type

80. Explain the germination of pollen grain with the help of a diagram.
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