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Why Pollen grain can be preserved as fos...

Why Pollen grain can be preserved as fossils?

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Pollen grains can be stored for several years in liquid nitrogen having a temperature of

QUESTIONS FROM CBSE BOARD EXAMINATIONS : The microscopic pollen grains of the past are obtained as fossils. Mention the characteristic of pollen grains that makes it happen.

Where the pollen grains are produced?

Which of the following has proved helpful in preserving pollen as fossils

How are magnets safely preserved?

Why do pollen grains of some flowers trigger sneezing in some people?

ADDITIONAL QUESTIONS : Why do you think the exine of pollen grain should be hard? What is the function of germ pore?

Spiny or sticky pollen grains and large,attractively coloured flowers are associated with

MBD-SEXUAL REPRODUCTION IN FLOWERING PLANTS -Exercise
  1. Why Pollen grain can be preserved as fossils?

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  2. What is the genetic constitution of endosperm in angiosperms?

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  3. Mention the reason for difference in ploidy of zygote and primary endo...

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  4. Name the sperm lysins.Which orgenelle secrete it.What is its function?

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  5. Fertilization is not an obligatory event for fruit production in certa...

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  6. Where would you look for coleoptile and coleorhiza?

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  7. On the basis of structure of the embryo, how would you identify whethe...

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  8. In a flower, if the megaspore mother cell forms megaspores without und...

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  9. In some plants, the female gamete develops into embryo without fertili...

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  10. Define triple fusion. What is bagging technique?

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  11. Why are banana seedless?

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  12. How tapetal cell in microsporangium can become binucleate?

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  13. What is Apomixis ? What is its importance ?

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  14. Differentiate true fruit and false fruit. Give example in each case.

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  15. Give the structure of pollen grain.

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  16. Discribe the post-fertilisation changes in a flower.

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  17. Describe the stages in embryo development in a dicot plant.

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  18. Why the cleavage in mammals referred as simple holoblastic?

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  19. Draw a diagram of fertilized embryo sac showing zygote and PEN.

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  20. Why does endosperm development precede embryo development in angiosper...

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