Home
Class 12
BIOLOGY
In an area where DDT had been used exten...

In an area where DDT had been used extensively the population of birds declined significantly because

A

Cobras were feeding exclusively on birds

B

Many of the birds eggs laid, did not hatch

C

Birds stopped laying eggs

D

Earthworms in the area got eradicated

Text Solution

Verified by Experts

The correct Answer is:
B
Promotional Banner

Topper's Solved these Questions

  • ENVIRONMENTAL ISSUES

    AAKASH INSTITUTE ENGLISH|Exercise ASSIGNMENT SECTION D|15 Videos

  • ENVIRONMENTAL ISSUES

    AAKASH INSTITUTE ENGLISH|Exercise ASSIGNMENT SECTION B|35 Videos

  • ECOSYSTEM

    AAKASH INSTITUTE ENGLISH|Exercise Section - D (Assertion - Reasion Type questions)|15 Videos

  • EVOLUTION

    AAKASH INSTITUTE ENGLISH|Exercise TRY YOURSELF|29 Videos

Similar Questions

Explore conceptually related problems

How has DDT caused decline in bird population ?

How has DDT caused decline in bird population ?

Cause of decline in population of reptiles and birds is

Discuss why Drosophila has been used extensively for genetical studies?

Biomagnification of DDT caused decline in bird population by:

A crane had DDT level as 5 ppm in its body. What would happen population of such birds ? Explain giving reasons

A lake near a village suffered heavy mortality of fishes within a few days Consider the following reasons for this? (a) Lots of urea and phosphate fertilizers were used in the crops in the vicinity. (b) The area was sprayed with DDT by an aircraft. (c) The lake water turned green and stinky. (d) Phytoplankton population in the lake declined initially thereby greatly reducing photosynthesis. Which two of the above were the main causes of fish mortality in the lake?

A lake near a village suffered heavy mortality of fishes within a few days. Which of the following statements could be the correct explanation for this ? (i) Lots of urea and phosphate fertillisers were used in the crops in the nearby fields. (ii) The croplands of the village were fertillised fields rich in nitrate and phosphate. (iii) The lake water turned green and stinky. (iv) Phytoplankton populations in the lake declined initially thereby greatly reducing photosynthesis.

Escherichia coli is used extensively in biological research, because it is

Plasmid has been used as vector because

AAKASH INSTITUTE ENGLISH-ENVIRONMENTAL ISSUES-ASSIGNMENT SECTION C
  1. Kyoto Protocol was endosed at

    Text Solution

    |

  2. Which one of the following is a wrong statement?

    Text Solution

    |

  3. In an area where DDT had been used extensively the population of bird...

    Text Solution

    |

  4. Which one of the following statement is wrong in case of Bhopal traged...

    Text Solution

    |

  5. Which one of the following pairs of gases are the major cause of "Gree...

    Text Solution

    |

  6. "Good ozone" is found in the

    Text Solution

    |

  7. Eutrophication is often seen in

    Text Solution

    |

  8. The two gases making highest ralative contribution to the greenhouse g...

    Text Solution

    |

  9. When domestic sewage mixes with river water

    Text Solution

    |

  10. dB is a standard abbreviation used for the quantitatve expression of

    Text Solution

    |

  11. Global agreement in specific control strategies to reduce the release ...

    Text Solution

    |

  12. Steps taken by the Government of India to control air pollution includ...

    Text Solution

    |

  13. Montreal Protocol aims at:

    Text Solution

    |

  14. Biochemical Oxygen Demand (BOD) in a river water

    Text Solution

    |

  15. Chipko movement was launched for the protection of

    Text Solution

    |

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

    Text Solution

    |

  17. Which of the following is the correct percentage of the two (out of th...

    Text Solution

    |

  18. World Summit on Sustainable Development was held in 2002 at Johannesbe...

    Text Solution

    |

  19. According to Central Pollution Control Board (CPCB), which particular ...

    Text Solution

    |

  20. A lake near a village suffered heavy mortality of fishes within a few ...

    Text Solution

    |