Describe the development of microspore in angiosperms. from Biolo

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 Multiple Choice QuestionsOne Word Answers

31. Give an example of insect pollinated plant.
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32. Receptive part of a carpel :
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33. Outer coat of a pollen grain :
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34. Nutritive tissue in the ovule :
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 Multiple Choice QuestionsShort Answer Type

35. Why is an embryo sac diploid in agamospermy ?
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 Multiple Choice QuestionsLong Answer Type

36. Draw L.S. of typical flower showing its parts.
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37.

Draw well labelled diagram of

A. Transverse section of anther.
B. Enlarged view of one microsporangium showing wall layers

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38. Describe the structure of microsporangium.
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39. Describe the development of microspore in angiosperms.


Microsporogenesis and formation of pollen grains.

1. Every cell of the sporogenous tissue is a potential pollen mother cell (PMC) and can give rise to microspore tetrad/ pollen grains.

2. But some of them forego this potential and others become differentiated into the pollen mother cells or microspore mother cells.

3. Each microspore mother cell undergoes meiosis to form a cluster of four haploid cells, called microspore tetrad.

        Microsporogenesis.

4. As the anther matures, the microspores dissociate from the tetrad and develop into pollen grains.

5. The tetrad may be tetrahedral, isobilateral, T-shaped, L-shaped and linear.

6. The nucleus of the microspore undergoes mitosis to form large vegetative cell and a small spindle-shaped generative cell, that floats in the cytoplasm of the vegetative cell.

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 Multiple Choice QuestionsShort Answer Type

40. Draw a diagrammatic sketch of the sectional view of a typical anatropous ovule.
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