How does a pollen mother cell develop into a mature pollen grain? Illustrate the stages with labelled diagrams.

5

(a)

(a) Differentiate between: Autogamy, geitonogamy and xenogamy.
(b) Explain the events that occur during pollen-pistil interaction.

5

(a)

(a) Describe the process of syngamy and triple fusion in angiosperms.
(b) Explain the development of a fertilised egg upto a mature embryo in a dicot plant. draw a labelled diagram of a mature dicot embryo,

5

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(a) Draw a labelled schematic diagram of the transverse section mature anther of an angiospermic plant. 
(b) Describe the characteristic features of an insect-pollinated flower.

5

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(a) Describe in sequence the process of megasporogenesis in angiosperms.
(b) Draw the seven-celled structure formed and label all the different cells.

5

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Explain with help of a diagram, the development of a mature embryo sac from a megaspore mother cell in an angiosperm.

5

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Differentiate between microsporogenesis and megasporogenesis. Which type of cell division occurs during these events? Name the structures formed at the end of these two events.

5

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With a neat, labelled diagram, describe the parts of a typical angiosperm ovule.

5

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What do you mean by development of embryo? Support the answer with diagram.                         

5

(a)

Write a note on the development of endosperm. Mention the types with examples.

5

(a)