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Pollen grains are able to tolerate extre...

Pollen grains are able to tolerate extremes of temperature and desiccation because their exine consists of:

A

cutin

B

suberin

C

sporopollenin

D

callose

Text Solution

Verified by Experts

The correct Answer is:
C
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The leaves of gymnosperms are well-adapted to withstand extremes of temperature, humidity and wind, because of which of the following features?

Assertion : Exine of a pollen grain is made up of sporopollenin which is resistant to high temperature, strong acid or alkali as well as enzymatic degradation. Reason : Sporopollenin is absent in the region of germ pores.

Name a prominent aperture in pollen grain exine.

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One of the most resistant biological material present in the exine of pollen grain is

Name the plant in which the pollen grains are not covered by exine.

Read the given statements. (i) Outer exine is made up of sporopollenin. (ii) Inner intine is pecto-cellulosic in nature (iii) Generative cell is bigger and contains abundant food reserve (iv) Vegetative cell is small and floats in the cytoplasm of the generative cell. Which of the given statements are not true regarding structure of pollen grain?

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MODERN PUBLICATION-SEXUAL REPRODUCTION IN FLOWERING PLANT-EXERCISE
  1. In angiosperms, triple fusion produces :

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  2. In flowering plants, archesporium gives rise to :

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  3. Pollen grains are able to tolerate extremes of temperature and desicca...

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  4. Secondary nucleus present in the middle of embryo sac is :

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  5. Correct the sentences, if required by changing the underlined word. ...

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  6. Ovule integument gets transformed into :

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  7. In nature, cleistogamous flowers are :

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  8. From which cells of embryo plumule is produced?

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  9. From which cells peripheral region of radical is produced ?

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  10. Name the process of embryo sac formation from cell of nucellus, withou...

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  11. Mesogamy is :

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  12. Nucellus froms which of the following part of fruit ?

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  13. Number or chormosome in an angiospermic plant is 14, then the number o...

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  14. Double fertilization is the process in the plants that includes

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  15. Unisexuality of flowers prevents :

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  16. Which of the following shows triploid nature in flowering plants ?

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  17. Which one of the following is not a device to promote cross-pollinatio...

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  18. Ornithophily refers to the pollination by which of the following ?

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  19. The water of green coconut is :

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  20. The hilum and micropyle lie side by side very close to each other in :

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