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WAEC Biology 2005 Question 20

Question 20

Microorganisms and Health

Only specially adapted micro-organisms are found in

  1. A.salty water
  2. B.humid air
  3. C.moist soil
  4. D.mouth cavities
Show the answer and explanation

Answer: A (salty water)

Explanation

Very salty water draws water out of most cells by osmosis, so only salt-tolerant (halophilic) microbes can live there.