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JEE Main levelSingle correct optionDifficulty 2 of 3ev179

Assertion (A): DDT undergoes biomagnification in food chains. Reason (R): DDT is a chlorinated organic compound.

  1. ABoth A and R are true and R is the correct explanation of A
  2. BBoth A and R are true but R is not the correct explanation of A
  3. CA is true but R is false
  4. DA is false but R is true

Answer: B

A is true because DDT is stored in fat and its concentration increases up the trophic levels. R is also a true statement, but being chlorinated does not by itself cause biomagnification. The cause is its fat solubility and resistance to metabolism, so R is not the explanation.
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