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The microscopic pollen grains of the pas...

The microscopic pollen grains of the past are obtained as fossils. Mention the characteristic of the pollen grains that makes it happen .

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The outer layer of microspore, exine is thick. It is covered with special type of cutin called sporopollenin which is resistant to chemical and biological decomposition:
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MODERN PUBLICATION-SEXUAL REPRODUCTION IN FLOWERING PLANTS-Revison Exercises (B. Questions From Cbse Board Examinations)
  1. In the following figure of a fruit, label the part which his protectiv...

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  2. Name the parts of an angiosperm flower in which development of male an...

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  3. The microscopic pollen grains of the past are obtained as fossils. Men...

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  4. Mention the pollinating agent of an inflorescence of small dull colour...

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  5. The meiocyte of an onion plant contains 32 chromosomes. Workout the nu...

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  6. A bilobed, dithecous anther has 100 microspore mother cells per micros...

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  7. An anther with malfunctioning tapetum often fails to produce viable ma...

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  8. Cucurbits and papaya plants bear staminate and pistillate flowers. Men...

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  9. The following statements describe the wind pollinated plants. Which on...

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  10. Give an example of a plant which came into India as a contaminant and ...

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  11. Give an example of a plant which came into India as a contaminant and ...

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  12. An anther with malfunctioning tapetum often fails to produce viable ma...

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  13. What is double fertilization in angiosperms?

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  14. How does the pollen mother cell develop into a mature pollen grain? Il...

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  15. Draw a longitudinal section of a post-pollinated pistil showing entry ...

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  16. (i ) Write the characteristics features of anther, pollen and stigma o...

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  17. (a) Mention any four strategies adopted by flowering plants to prevent...

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  18. Write the function of tapetum in anthers.

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  19. Explain the function of each of the following : (a) Coleorihiza , ...

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  20. Explain any three advantages the seeds offer to angiosperms.

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