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WAEC Biology 2020 Question 12

Question 12

Transport in Plants

The diagram below is an illustration of an experimental set-up. The set-up directly measures

Diagram for this question
  1. A.transpiration of water by the shoot.
  2. B.evaporation of water from the leaves.
  3. C.absorption of water by the shoot.
  4. D.loss of mineral salts from the leaves.
Show the answer and explanation

Answer: C (absorption of water by the shoot.)

Explanation

This is a potometer. The air bubble moves as the cut shoot draws water from the tube, so what is measured directly is the rate of water uptake. Transpiration is estimated from it.