WAEC Biology 2020 Objective — Question 12
Question 12 of 50 from the West African Examinations Council (WAEC) Biology 2020 Objective paper, with the correct answer and a full explanation.
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The set-up directly measures
- A. transpiration of water by the shootCorrect
- B. evaporation of water from the leaves
- C. absorption of water by the shoot
- D. loss of mineral salts from the leaves
Explanation
The experimental set-up (photometer/potometer, with syringe, capillary tubing and air bubble) directly measures the rate of water transpired/absorbed by the shoot, indicated by the movement of the air bubble.
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