Biology HL (FE2025)
Paper 2
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Biology HL (FE2025)
Available time 20 Minute(s)
01

The graph below was plotted after an experiment was carried out on sweet orange using leaf discs regarding the relationship between temperature and photosynthesis

Paper 2
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Available time 20 Minute(s)
01. Question
Level Medium
Maximum Mark 9
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The graph below was plotted after an experiment was carried out on sweet orange using leaf discs regarding the relationship between temperature and photosynthesis. Gross photosynthesis was calculated by adding the rate of photosynthesis and respiration. Net photosynthesis only shows the rate of photosynthesis.

(a) Determine the optimum temperature of this plant from the graph given above

[Marks: 1]

Calculate the difference between gross and net photosynthesis for the following temperatures.

(b) (i) 30C

[Marks: 1]

(b) (ii) 50C

[Marks: 1]

(c) Describe and explain the changes in the rate of net photosynthesis when the temperature increases from 40C to 50C

[Marks: 3]

(d) Outline the general effect of temperature on the rate of photosynthesis in this plant

[Marks: 3]
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