Question 37
Transport in PlantsThe graphs show the results of experiments which investigated the effect of temperature and oxygen on the rate of uptake of certain ions labelled X and Y by a plant root.
Which of the temperature ranges will likely favour the plant best?
- A.0 – 10°C
- B.15 – 20°C
- C.30-40°C
- D.45 – 50°C
- E.above 50°C
Show the answer and explanation
Answer: D (45 – 50°C)
Explanation
Ion uptake rises to its highest at about 45–50 °C; above that it drops sharply as enzymes are destroyed.