A scientist investigates the effect of temperature on the rate of photosynthesis in three plant species. Figure 2.1 shows the results of the investigation.

Figure 2.1, a plotted graph of rate of photosynthesis as a percentage of maximum against temperature from −5 to 40 °C for three species: species 1 (solid line) rises from 60 at −3 °C to 100 at 5 °C and falls to 0 at 30 °C; species 2 (dashed) peaks at 100 at 17 °C and falls to 30 at 40 °C; species 3 (dotted) rises from 53 at 15 °C to 100 at 30 °C

At the maximum rate of photosynthesis, species 1 makes 15.0 g of carbohydrate per day. Use Figure 2.1 to calculate the mass of carbohydrate made by species 1 per day at

0^{\circ} C

Answer

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2(a)(ii)Interpreting Data Drawing ConclusionsMedium2 marks

The scientist forms several conclusions. Tick (✓) all the conclusions that are supported by the data in Figure 2.1.

Draw with the mouse or a finger.

2(a)(iii)Limiting Factors PhotosynthesisHard6 marks

Use Figure 2.1 to describe and explain the effect of temperature on the rate of photosynthesis for species 1.

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2(b)(i)PhotosynthesisEasy2 marks

State the balanced chemical equation for photosynthesis.

2(b)(ii)Plant Mineral NutritionEasy2 marks

Explain why plants need magnesium ions to photosynthesise.

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2(c)CarbohydratesEasy3 marks

The carbohydrate made during photosynthesis is made into larger carbohydrates with specific functions. Complete Table 2.1.

carbohydrate	function in a plant
starch	Table answer starch_function in a plant 0 words
cellulose	Table answer cellulose_function in a plant 0 words
Table answer phloem_carbohydrate	translocated in the phloem