Home
Class 12
BIOLOGY
[A] : Lichens are of considerable ecolog...

[A] : Lichens are of considerable ecological imporance as pioneers in colonization of rocky habitats by plants .
[R] : The lichens excrete organic acids which disintegrate rocks , thus forming soil or substrata in which other kinds of plants become established .

A

If both A and R are true and R is the correct explanation of A

B

If both A and R are true but R is not the correct explanation of A

C

If A is true and R is false

D

If both A and R are false

Text Solution

Verified by Experts

Promotional Banner

Topper's Solved these Questions

  • EVOLUTION

    TRUEMAN BIOLOGY|Exercise MULTIPLE CHOICE QUESTIONS|335 Videos

  • Genetics

    TRUEMAN BIOLOGY|Exercise ASSERTION AND REASON|123 Videos

Similar Questions

Explore conceptually related problems

Mosscs are ecologically important because I. first organism to colonize bare rocks. II. Decompose rocks making suitable for growth of higher plant. III. Form dense mats on soil. IV. Reduce impact of falling rain and soil erosion.

TRUEMAN BIOLOGY-Fungi -ASSERTION AND REASON
  1. [A] : Endomycorrhiza of forest trees contribute to the efficient nutri...

    Text Solution

    |

  2. [A] : Lichens are of considerable ecological imporance as pioneers in ...

    Text Solution

    |

  3. [A] : Bordeaux mixture is an organic fungicide . [R] : Bordeaux mixt...

    Text Solution

    |

  4. [A] : The obligate parasites can live only on dead hosts . [R] : The...

    Text Solution

    |

  5. [A] : Disease reduce the vitality of plants , inhibit their developmen...

    Text Solution

    |

  6. [A] : Lichens are composite organisms . [R] : The fungal component i...

    Text Solution

    |

  7. [A] : Candida is a false yeast . [R] : It lacks ascus formation .

    Text Solution

    |

  8. [A] : Heterotrophs may be free living or symbiotic . [R] : They from...

    Text Solution

    |

  9. [A] : Rusts and smuts are club fungi that parasitize cereal crops . ...

    Text Solution

    |

  10. Assertion : The fungi are widespread in distribution and they even liv...

    Text Solution

    |

  11. [A] : Symbiosis is also furnished by mycorrhiza . [R] : In Mycorrhiz...

    Text Solution

    |

  12. [A] : Phytoalexins are formed as a result of fusion between auxins and...

    Text Solution

    |

  13. [A] : Zygospore fungi produce spores within sporangia . [R] : During...

    Text Solution

    |

  14. [A] : Club fungi reproduce sexually . [R] : In club fungi , dikaryot...

    Text Solution

    |

  15. [A] : The sterile portion of sporangium in Mucor is called columella ....

    Text Solution

    |

  16. [A] : Fungi are thallophyta . [R] : Cell wall of fungi is made up of...

    Text Solution

    |

  17. [A] : Fungi are either saprobes or parasitic . [R] : Fungi posses ha...

    Text Solution

    |

  18. [A] : Rhizopus contains two types of hyphae . [R] : The unbranched h...

    Text Solution

    |

  19. [A] : Puccinia graminis is autoecious . [R] : It complete its life c...

    Text Solution

    |

  20. [A] : Schizosaccharomyces is also called the fission yeast . [R] : S...

    Text Solution

    |