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WAEC Biology 2018 Question 24

Question 24

Transport in Plants

The ascent of water in tall trees is mainly due to

  1. A.adhesive forces.
  2. B.transpiration pull.
  3. C.root pressure.
  4. D.cohesive forces.
Show the answer and explanation

Answer: B (transpiration pull.)

Explanation

Water evaporating from the leaves pulls the column of water up the xylem from the roots. This transpiration pull is the main force in tall trees.