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Exine of pollen grain is made up of...

Exine of pollen grain is made up of

A

pectocellulose

B

ligno cellulose

C

sporopollenin

D

pollen kit

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The correct Answer is:
C
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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.

Identify the pair of wrong statements I. Intine of pollen grains is made up of sporopollenin, II.l Pollen grains are well preserved as fossils because of the presence of sporopollenin, III. Enzymes can degrade the organic material of the pollen grain exine, IV. Sporopollenin can withstand high temperature, strong acids and alkali

pollen grains

Intine of pollen grain is made of

Which one of the following statements is not true? (a) Stored pollen in liquid nitrogen can be used in the crop breeding programme (b) Tapetum helps in dehiscence of anthers (c) Exine of pollen grains is made of sporopollenin (d) Pollen grains of many species cause severe allergies

(a) Name the organic material exine of the pollen grain is made up of. How is this material advantageous to pollen grain ? (b) Still it is observed that it does not form a continuous layer around the pollen grain. Give reason. (c) How are 'pollen banks' useful ?

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Diameter of pollen grain is

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AAKASH SERIES-SEXUAL REPRODUCTION IN FLOWERING PLANTS -EXERCISE - I (Introduction, Microsporophyll, Anther, Male gametophyte)
  1. Flower organs have evolved from modified

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  2. A typical anther of an angiosperm is

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  3. Male gametes are formed by

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  4. How many nuclei are present in a mature pollen?

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  5. The intine of a pollen grain is mainly made up of

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  6. The exine of a pollen grain is composed of one of the most resistant ...

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  7. Sculpturing of exine of pollen is important in

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  8. Male gametes in angiosperms are formed by the division of

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  9. In flowering plants, mature male gametophyte is derived from a polle...

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  10. In a flowering plant 2n = 24, the number of chromosomes in its endospe...

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  11. Pollen grains are shed at

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  12. Fusion of male gamete with polar nuclei of embryo sac is known as

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  13. Tapetum occurs in

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  14. Which one of the following statements is correct?

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  15. Exine of pollen grain is made up of

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  16. Pollen tablets are available in the market for

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  17. Which of the following statements about sporopollenin is incorrect ?

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  18. In angiosperms how many male gametes are produced by one meiosis in on...

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  19. Male gametes in angiosperms are formed by the division of

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  20. If there are 40 pollen mother cells in anther, what will be the number...

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