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WAEC Biology 2014 Question 4

Question 4

Cell and Its Environment

Active transport can be defined as the movement of

  1. A.substances from a region of high concentration to a region of low concentration.
  2. B.substances from a region of low concentration to a region of high concentration across a living cell membrane.
  3. C.substances across a living cell membrane using energy from the cell.
  4. D.movement of molecules in a medium.
Show the answer and explanation

Answer: B (substances from a region of low concentration to a region of high concentration across a living cell membrane.)

Explanation

Active transport moves substances against the concentration gradient (low to high) across a living membrane, which needs energy from respiration.