Home
Class 12
BIOLOGY
How do organisms cope with stressful ext...

How do organisms cope with stressful external environmental conditions whichare localised or of short duration ?

Text Solution

Verified by Experts

The following methods are employed by organisms to cope with stressful conditions: (i) Migrate temporarily from the stressful habitat to a hospitable area, (ii) Suspend activities, (iii) form thick walled spores, (iv) form dormant seeds (v) hibernate during winter, (vi) aestivate during summer, (vii) Planktons undergo diapause.
Promotional Banner

Topper's Solved these Questions

  • XII BOARDS

    XII BOARDS PREVIOUS YEAR|Exercise SET-II|44 Videos
  • XII BOARDS

    XII BOARDS PREVIOUS YEAR|Exercise SET-III|57 Videos
  • XII BOARDS

    XII BOARDS PREVIOUS YEAR|Exercise C.B.S.E CLASS XII|31 Videos
  • SAMPLE PAPER 2019

    XII BOARDS PREVIOUS YEAR|Exercise Section E Part B|3 Videos
XII BOARDS PREVIOUS YEAR-XII BOARDS-SET-I
  1. Unambiguous, universal and degenerate are some of the terms used for t...

    Text Solution

    |

  2. Water is essential for life . Write any three features both for plants...

    Text Solution

    |

  3. How do organisms cope with stressful external environmental conditions...

    Text Solution

    |

  4. (a) State the consequence if the electrostatic precipitator of a therm...

    Text Solution

    |

  5. Give reasons why : (i) most zygotes in angiosperms divide only after c...

    Text Solution

    |

  6. Draw a labelled diagram of LS. of an embryo of grass (any six labels)....

    Text Solution

    |

  7. Describe the mechanism of pattern of inheritance of ABO blood groups i...

    Text Solution

    |

  8. (a) Why is haemophilia generally observed in human males ? Explain the...

    Text Solution

    |

  9. (i) Describe the characteristics a cloning vector must possess. (ii) W...

    Text Solution

    |

  10. If a desired gene is identified in an organism for some experiments, e...

    Text Solution

    |

  11. Why hnRNA is required to undergo splicing?

    Text Solution

    |

  12. The microscoppiocl len grains of the past are obtained as fossils. Men...

    Text Solution

    |

  13. How does colostrum provide initial proteetioh against diseases to new ...

    Text Solution

    |

  14. Name the unballed areans 'a' and 'b' of the pie chart (given above ) r...

    Text Solution

    |

  15. Mention the types of evolution that has brought the similarity as seen...

    Text Solution

    |

  16. Name the group of organisms and the substrate they act on to produce b...

    Text Solution

    |

  17. Mention the pollinating agent of an inflorescence of small dull colour...

    Text Solution

    |

  18. Name the organism commercially used for the production of single cell ...

    Text Solution

    |

  19. Explain the contribution of Thermus aquaticus in the amplification of ...

    Text Solution

    |

  20. What does the above diagram illustrate? Name the parts labelled 'a'...

    Text Solution

    |