Class XI

Two or more food chains may be interlinked through
  1. food web
  2. food cycle
  3. carbon cycle
  4. nitrogen cycle
 Energy of a photon and light wavelength are
  1. always same
  2. sometimes same
  3. directly proportionate
  4. inversely proportionate
Use of chemical fertilizers causes
  1. gaseous pollution
  2. water pollution
  3. air pollution
  4. all of these
Physical, mental abnormalities and risks of cancer are increased due to
  1. DDT
  2. BOD
  3. Dioxins
  4. Greenhouse effect
Basal metabolism, physical activity and heat- all collectively determine the
  1. energy intake
  2. energy expenditures
  3. energy in heart beat
  4. energy required to stay emotionally well
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