Class VIII

. Systems which open to external environment are protected from bacteria by presence of
  1. mucus membranes
  2. HCl
  3. hairs
  4. plug
Human skin is tough and water proof and germs cannot
  1. penetrate through
  2. stay on it
  3. reproduce
  4. enter from cut
Examples of microscopic organisms are
  1. bacteria
  2. micro-scopic fungi
  3. both a and b
  4. virus
Mushrooms, yeasts, moulds and toadstools are examples of
  1. bacteria
  2. virus
  3. fungi
  4. algae
Germs may enter body via
  1. mouth
  2. skin
  3. eyes
  4. all of them
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