Home
Class 12
BIOLOGY
Assertion : Exine of a pollen grain is m...

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.

A

If both assertion and reason are true and reason is the correct explanation of assertion

B

If both assertion and reason are true but reason is not the correct explanation of assertion

C

If assertion is true but reason is false

D

If both assertion and reason are false

Text Solution

Verified by Experts

The correct Answer is:
b
Promotional Banner

Topper's Solved these Questions

  • REPRODUCTIVE HEALTH

    NCERT FINGERTIPS|Exercise Reproductive Health|133 Videos

  • STRATEGIES FOR ENHANCEMENT IN FOOD PRODUCTION

    NCERT FINGERTIPS|Exercise Strategies For Enhancement In Food Production|151 Videos

Similar Questions

Explore conceptually related problems

Fill in the blanks : B. ……… of pollen grains is made up of sporopollenin.

In pollen grains where sporopollenin is absent called germ pore.

The exine of pollen grain is made up of .........and has germ pores :-

Assertion :- Pollen grainscan withstandhigh temperature and strong acids and alkali. Reason-Theirnnehrarldayeirn tinisemaduep of sporopollenin

(A) : Exine of pollen is chiefly made up of sporopollenin. (R): Sporopollenin is chemically a polymer of fructose.

Sporopollenin in exine of pollen grain can be degraded

Sporopollenin in exine of pollen grain can be degraded by

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

NCERT FINGERTIPS-SEXUAL REPRODUCTION IN FLOWERING PLANTS-Sexual Reproduction In Flowering Plants
  1. While planning for an articifical hybridisation programmme involving d...

    Text Solution

    |

  2. In the embryos of a typical dicot and a grass, true homologous structu...

    Text Solution

    |

  3. The phenomenon observed in some plants wherein parts of the sexual ap...

    Text Solution

    |

  4. In a flower, if the megaspore mother cell forms magaspores without und...

    Text Solution

    |

  5. The phenomenon wherein, the ovary develops into a fruit without fertil...

    Text Solution

    |

  6. Assertion : An angiospermous flower represents the modified condensed ...

    Text Solution

    |

  7. Assertion : A typical microsporangium of angiosperms is generally surr...

    Text Solution

    |

  8. Assertion : In a microsporangium, the tapetal cells possess tittle cyt...

    Text Solution

    |

  9. Assertion : In most angiosperms, microspores of a tetrad grow and sepa...

    Text Solution

    |

  10. Assertion : Exine of a pollen grain is made up of sporopollenin which ...

    Text Solution

    |

  11. Assertion : The method of development of embryo sac from a single func...

    Text Solution

    |

  12. Assertion : Although geitonogamy is functionally crosspollination invo...

    Text Solution

    |

  13. Assertion : Hydrophily constitues a major mode of pollination in most ...

    Text Solution

    |

  14. Assertion : Only the pre-pollination growth of male gametophyte occurs...

    Text Solution

    |

  15. Assertion : Self-incompatibility is a genetic mechanism which prevents...

    Text Solution

    |

  16. Assertion : In angiosperms, endosperm development precedes embryo deve...

    Text Solution

    |

  17. Assertion : In Cocos nucifera coconut water represents the cellular en...

    Text Solution

    |

  18. Assertion : During embryo development in dicots, suspensor serves as t...

    Text Solution

    |

  19. Assertion : Ex-albuminous seeds do not possess any residual endosperm,...

    Text Solution

    |

  20. Assertion : In plants, apomixis is a form of asexual reporduction that...

    Text Solution

    |