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Where is sporopollenin present in plants...

Where is sporopollenin present in plants? State its significance with reference to its chemical nature.

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Sporiopollenin is a chemical substances which forms the hard outer layer, the exine of the pollen grains. It is one of the most resistnt organic material. It can withstand high temperatures, strong acids and alkali. No enzyme can degrade sporopollenin. Pollen grains are preserved as fossils because of the presence of sporopollenin.
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ARIHANT PUBLICATION-SEXUAL REPRODUCTION IN FLOWERING PLANTS-QUESTIONS FOR PRACTICE (Part I Flower, Pre -Fertilisation: Events and Pollination Short Answer Type Questions)
  1. Name all the haploid cells present in an unfertilised mature embryo s...

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  2. Explain the role of tapetum in the formation of pollen grain wall.

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  3. How does the pollen grow through the style? Explain briefly.

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  4. Make a list of any three outbreeding devices that flowering plants hav...

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  5. Explain the significant of pollination in flowering plants .

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  6. What is hydrophily? Name any hydrophilous plant and give its importan...

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  7. Geitonogamous flowering plants are genetically autogamous but function...

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  8. Explain the function of each of the following (i) Coleorhiza (ii) Ge...

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  9. Where is sporopollenin present in plants? State its significance with...

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  10. What is pollen kit? Write a short note on pollen viability.

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  11. Write the mode of pollination is Vallisneria and water lily. Explain t...

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  12. Trace the development of microsporocyte in the anther to a mature poll...

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  13. What are chasmogamous flowers? Can cross-pollination occur in cleisto...

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  14. Why do some plants have both chasmogamous and cleistogamous flowers?

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  15. Why is geitonogamy also referred to as genetical autogamy?

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  16. Some plants have a mechanism of shedding of pollen before maturation o...

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  17. What is self-incompatibility ? Why does self-pollination not lead to s...

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  18. Mention two strategies evolved to prevent self-pollination in flowers...

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  19. Not all hydrophytes are pollinated by water. Justify by giving two exa...

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  20. Does self incompatibility imposes and restrictions on autogamy? Give r...

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