Home
Class 12
BIOLOGY
Assertion : Agriculture production incre...

Assertion : Agriculture production increased several times after introuduction of DDT .
Reason : DDT was first insecticide used on a wide scale .

A

If both Assertion and Reason are true and the reason is the correct explanation of the assertion , then mark (1) .

B

If both Assertion and Reason are true but the reason is not the correct explanation of the assertion , then mark (2).

C

If assertion is true but Reason is false , then false , then mark(3).

D

If both assertion is true Reason are false , then Mark (4).

Text Solution

Verified by Experts

The correct Answer is:
A
Promotional Banner

Topper's Solved these Questions

  • MICROBES IN HUMAN WELFARE

    CENGAGE BIOLOGY ENGLISH|Exercise ASSERTION-REASONING QUESTIONS|1 Videos
  • MICROBES IN HUMAN WELFARE

    CENGAGE BIOLOGY ENGLISH|Exercise ARCHIVES|26 Videos
  • HUMAN REPRODUCTION

    CENGAGE BIOLOGY ENGLISH|Exercise Assertion -Reasoning Question|16 Videos
  • ORGANISMS AND POPULATIONS

    CENGAGE BIOLOGY ENGLISH|Exercise ARCHIVES (Choose the correct options)|29 Videos

Similar Questions

Explore conceptually related problems

Assertion: Agricultural output increased several times after introducing of DDT Reason:DDT was the first insecticide used on a wide scale

Assertion : If amplitude of SHM is increased , time period of SHM will increase. Reason: If amplitude is increased, body have to travel more distance in one complete oscillation.

What is not useful to increase agriculture production

Assertion (A): The rate of reaction increases generally by 2 to 3 times for every 10^(@)C rise in temperature. Reason (R ): An increase intemperature increases the colliison frequency.

Assertion : Emulsification is necessary for the digestion of fat. Reason : After fats are emulsified, the action of enzyme amylase gets significantly increase.

Assertion : Emulsification is necessary for the digestion of fat. Reason : After fats are emulsified, the action of enzyme amylase gets significantly increase.

Assertion : Gibberellin is useful in early seed production in conifers. Reason : Ethephon is responsible for early ripening in tomato and apple

Assertion : Order of a reaction with respect to any reactant can be zero, positive negative of fractional. Reason : Rate of a reaction cannot decrease with increase in concentration of a reactant or a product.

Assertion: The value of ionic product of water (K_w) increases on increasing the temperature. Reason: The ionisation of water increases with an increase in temperature.

CENGAGE BIOLOGY ENGLISH-MICROBES IN HUMAN WELFARE-ARCHIVES
  1. Assertion : Agriculture production increased several times after int...

    Text Solution

    |

  2. Cry 1 endotoxins obtins obtained from Bacillus thuringiensis are...

    Text Solution

    |

  3. Human insulin is being commercially produced from a transgenic...

    Text Solution

    |

  4. Trichoderma harizianum has proved to be a useful microorganism for

    Text Solution

    |

  5. DDT residues are rapidly passed through food chain causing biomagnific...

    Text Solution

    |

  6. Which one of the following is not used in or- ganic farming?

    Text Solution

    |

  7. The common nitrogen-fixer in paddy fields is

    Text Solution

    |

  8. A common biocontrol agent for the control of plant diseases is

    Text Solution

    |

  9. When domestic sewage mixes with river water

    Text Solution

    |

  10. Which one of the following helps in absorp- tion of phosphorus from so...

    Text Solution

    |

  11. Which one of the following is not a biofertlizer

    Text Solution

    |

  12. Which one of the following is an example .o f carrying out biological ...

    Text Solution

    |

  13. maximum nutritional diversity is found in the rice fields is

    Text Solution

    |

  14. A nitrogen fixing microbe associated with Azolla in rice fields is

    Text Solution

    |

  15. Yeast is used in the production of

    Text Solution

    |

  16. Which one of the following microbes forms symbiotic association with p...

    Text Solution

    |

  17. A patient brought to a hospital with myocar- dial infarction is normal...

    Text Solution

    |

  18. monascus purpureus is a yeast used commercially in the production of

    Text Solution

    |

  19. Green revolution in India occurred during

    Text Solution

    |

  20. In gobar gas, the maximum amouts is that of Or Biogas produced thr...

    Text Solution

    |

  21. The domestic sewage in large cities

    Text Solution

    |