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Railways PYQCBT 1 2016

RRB NTPC · Question 19

What is the cause of biomagnification (or bio-accumulation)? A. Ozone. B. Organo-chlorines. C. Lichens. D. Proteins.

  1. D

  2. A

  3. B

  4. C

Show answer & explanation

Answer: (C) B

Explanation

Persistent organochlorine pesticides such as DDT are not broken down or excreted, so they build up in organisms and concentrate up the food chain (biomagnification).