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
    $(i)$ and $(iii)$
  • B
    $(iii)$ and $(iv)$
  • C
    $(ii)$ and $(iii)$
  • D
    $(i)$ and $(iv)$

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$(i)$ Damage to immune system
$(ii)$ Damage to lungs
$(iii)$ Skin cancer
$(iv)$ Peptic ulcers

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Differentiate between biodegradable and non-biodegradable substances. Cite examples.

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