2 marksNitrate is an important source of nitrogen which is needed to make amino acids.
Other than nitrogen, identify two other chemical elements that could be found in amino acids.
2 marksSome plants may grow in nutrient poor soils where they are not able to absorb enough nitrate through their roots.
Describe the appearance of a plant that is deficient in nitrate.
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2 marksA student carried out an investigation into the effect of soil magnesium on plant growth.
In this investigation, the student set up two different environments as follows:
Predict what the student will have observed after two weeks of growing in these conditions.
4 marksExplain your prediction from part (a).
3 marksWhen selecting the plants for the investigation in part (a), the student made sure that they picked plants with the same number of leaves.
Explain why this was necessary.
2 marksOne method that can be used to show that photosynthesis has occurred is to test the leaves with iodine.
Explain how this shows that photosynthesis has occurred.
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4 marksPlants growing in soils lacking magnesium ions struggle to photosynthesise and therefore do not grow to their full potential.
Suggest an explanation why.
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Fig. 1 shows the effect on crop yield (amount harvested) of using nitrogen-containing fertilisers.
Fig.1
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State one type of mineral ion, other than nitrate, that is required by a plant and explain its importance to the plant.
type of mineral ion ...........................................................
importance to plant ..........................................................
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