Organisms of a higher trophic level which feed on several types of organisms belonging to a lower trophic level constitute the

  • A
    ecological pyramid
  • B
    food web
  • C
    ecosystem
  • D
    food chain

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In a certain study conducted on the occurrence of $DDT$ along food chains in an ecosystem,the concentration of $DDT$ in grass was found to be $0.5\, ppm$ (parts per million),in sheep it was $2\, ppm$,and in man it was $10\, ppm$. Why was the concentration of $DDT$ maximum in the case of man?

Which of the following are called secondary consumers?

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