How does the concentration of a pesticide change once it enters a food chain?

  • A
    It decreases at each trophic level.
  • B
    It remains constant at each trophic level.
  • C
    It increases at each trophic level.
  • D
    It is eliminated at the first trophic level.

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Which group of organisms are not constituents of a food chain?
$(i)$ Grass,lion,rabbit,wolf
$(ii)$ Plankton,man,fish,grasshopper
$(iii)$ Wolf,grass,snake,tiger
$(iv)$ Frog,snake,eagle,grass,grasshopper

$(a)$ What percentage of energy available at the producer level is transferred at successive trophic level in a food chain?
$(b)$ What percentage of the solar energy is trapped and utilised by the plants?

Organisms which synthesise carbohydrates from inorganic compounds using radiant energy are called

Which of the following limits the number of trophic levels in a food chain?

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