Home
Class 12
BIOLOGY
Assertion : Ozone layer absorbs UV radia...

Assertion : Ozone layer absorbs UV radiations emitting from sunlight and prevents it from reaching the earth.
Reason: Due to continuous addition of `Cl^(-)` in the atmosphere, ozone is depleted.  
(A) both A and R are true and R is the correct explanation of A
(B) both A and R are true and R is not the correct explanation of A
(C) A is true but R is false
(D) Both A and R are false

A

both .A. and .R. are true and .R. is the correct explanation of .A:

B

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

C

.A. is true but .R. is false.

D

Both .A. and .R. are false.

Text Solution

Verified by Experts

The correct Answer is:
B
Promotional Banner

Topper's Solved these Questions

  • ENVIRONMENTAL ISSUES

    KUMAR PRAKASHAN|Exercise Section - F (Multiple Choice Question (MCQs))(MCQs ASKED IN COMPETITIVE EXAM)|22 Videos

  • ENVIRONMENTAL ISSUES

    KUMAR PRAKASHAN|Exercise Section - E (Solution of NCERT Exemplar)(Long Answer Type Questions )|7 Videos

  • ECOSYSTEM

    KUMAR PRAKASHAN|Exercise SECTION - F (MCQs ASKED IN COMPETTIVE EXAM)|84 Videos

  • EVOLUTION

    KUMAR PRAKASHAN|Exercise SECTION - F (Multiple Choice Questions)|198 Videos

Similar Questions

Explore conceptually related problems

A: Oyster produce pearls R : They are cultured for this purpose (A) A and R both are correct and R is correct explanation of A. (B) A and R are correct but R is not explanation of A. (C) A is correct and R is false. (D) A and R are false

A: Birds are uricotelic R : Birds lack urinary bladder (A) A and R both are correct and R is correct explanation of A. (B) A and R are correct but R is not explanation of A. (C) A is correct and R is false. (D) A and R are false

A: A fish cannot survive out of water R: It gets O_(2) from water (A) A and R both are correct and R is correct explanation of A. (B) A and R are correct but R is not explanation of A. (C) A is correct and R is false. (D) A and R are false

A: Most mammals are viviparous R : They feed their young ones with their milk (A) A and R both are correct and R is correct explanation of A. (B) A and R are correct but R is not explanation of A. (C) A is correct and R is false. (D) A and R are false

A: Birds have pneumatic Bones R: To reduce body weight for flying in the air (A) A and R both are correct and R is correct explanation of A. (B) A and R are correct but R is not explanation of A. (C) A is correct and R is false. (D) A and R are false

A : Mushrooms are not regarded plants. R : Unlike plants mushrooms are heterotrophic. (A) A and R both are correct and R is correct explanation of A. (B) A and R are correct but R is not explanation of A. (C) A is correct and R is false. (D) A and R are false

A: Blood does not clot as leech is sucking it R : An anticoagulant hirudin from the salivary gland checks blood clotting (A) A and R both are correct and R is correct explanation of A. (B) A and R are correct but R is not explanation of A. (C) A is correct and R is false. (D) A and R are false

A: Urochordates and cephalochordates are often called invertebrates chordates R : They are connecting link between invertebrates and the chordates (A) A and R both are correct and R is correct explanation of A. (B) A and R are correct but R is not explanation of A. (C) A is correct and R is false. (D) A and R are false

Assertion A: Pollen grains can survive against high temperature, conc acid and base. Reason R: Outer -layer of pollen grain is made up of sporopollenin (A) A and R both are true and R is correct explanation of A (B) A and R both are true, but R is not the explanation of A (C) A is true, R is wrong (D) A is wrong and R is true

KUMAR PRAKASHAN-ENVIRONMENTAL ISSUES-Section - F (Multiple Choice Question (MCQs))(MCQs FROM .DARPAN. BASED ON TEXTBOOK)
  1. By how much is earth's temperature expected to rise between 1950 and 2...

    Text Solution

    |

  2. By which method the measurement of oxygen essential for degradation of...

    Text Solution

    |

  3. Assertion : Ozone layer absorbs UV radiations emitting from sunlight a...

    Text Solution

    |

  4. In electrostatic precipitators, electric charge is generated on .........

    Text Solution

    |

  5. Which of the following can be done to control global warming ?   (A) ...

    Text Solution

    |

  6. How much particulate Matter pollution can be removed Electrostatic pre...

    Text Solution

    |

  7. A: Natural fertilizer is used in organic farming. R : Ramesh Chandra...

    Text Solution

    |

  8. Which of the following happens in first phase of waste water treatment...

    Text Solution

    |

  9. CPCB: Central Pollution Control Board :: NIOH : …  (A) New Institute ...

    Text Solution

    |

  10. Which type of pollution reduces the growth and causes premature death ...

    Text Solution

    |

  11. Which of the following is/are correct? (i) The .Ecosan. toilets are ...

    Text Solution

    |

  12. Which of the following is not included in noise pollution ?

    Text Solution

    |

  13. A: DDT is stored in the fat of body. R: DDT is used as pesticide.

    Text Solution

    |

  14. Assertion : City noise is sufficient to deafen people. Reason : Nois...

    Text Solution

    |

  15. Match the column.

    Text Solution

    |

  16. High dose of which of the following can cause snow blindness?

    Text Solution

    |

  17. Which type of pollution is removed by scrubber method ?

    Text Solution

    |

  18. Which is the group of green house gases ?

    Text Solution

    |

  19. How much forest area of total land was decreased in the total land in ...

    Text Solution

    |

  20. Which of the following is not a part of organic farming ?   (A) It in...

    Text Solution

    |