In areas where $DDT$ is used extensively,the bird population declines significantly because...

  • A
    Birds stop laying eggs.
  • B
    Earthworms are eradicated from the area.
  • C
    Cobras feed on the birds.
  • D
    Most of the birds lay eggs,but they do not hatch.

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The Biological Oxygen Demand $(BOD)$ of water is:

The phenomenon in which nutrient enrichment of a water body supports a dense growth of one or many organisms but decreases the species diversity is called:

The full form of $DDT$ is ..........

Which one of the following statements regarding $BOD$ is true?

If the concentration of lead in the blood reaches ........,it is considered a warning sign.

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