Class IX

Excess mucus is produced causing smokers cough due to
  1. nicotine
  2. Tar
  3. Irritants
  4. morphine
When body temperature rises, several mechanism help in loosing heat but mechanism that helps in reducing heat production is
  1. reduced breathing
  2. reduced rate of metabolism
  3. excessive sweating
  4. excessive vasodilation
Large gene pool enables
  1. conservation of natural resources
  2. depletion of natural resources
  3. conservation of artificial resources
  4. depletion of artificial resources
Plants pollinated through insects have
  1. small pollens
  2. light pollens
  3. short stamens
  4. nectar guides
Pyrethrum is used in
  1. insecticides
  2. quinine
  3. morphine
  4. antibiotics
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