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JAMB Biology 1989 Question 9

Question 9

Transport in Plants

Mineral salts can be absorbed into the roots by

  1. A.osmosis only
  2. B.osmosis and diffusion
  3. C.diffusion and active transport
  4. D.imbibition only
Show the answer and explanation

Answer: C (diffusion and active transport)

Explanation

Ions enter root hairs by diffusion when more concentrated outside, and by active transport (using energy) against a concentration gradient. Osmosis moves only water.