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Plants
6 Changing the conditions in which plants grow affects how fast they grow.
The diagram shows a propagator in which scientists can control temperature, light intensity and
carbon dioxide concentration.




The graph shows the effects of changing the temperature, light intensity and carbon dioxide
concentration on the growth of…

Page 2

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(2 marks)
6 (c) The nutrient solution contains nitrate ions and magnesium ions.
Complete the table to show the functions of these ions in plants and their deficiency symptoms.




(4 marks)

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9

7 A student investigated the effect of magnesium salts on the production of grain by wheat
plants…

Page 3

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(ii) Using evidence from the graph, explain why the amount of magnesium is not the limiting factor
under these conditions.
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(1 mark)
(iii) Explain why the mass of magnesium available to the plants affects the yield of grain.
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(2 marks)
(b) The average light…

Page 4

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1 (a) (i) Complete the word equation for photosynthesis.

Carbon dioxide +.................................. (+ light energy) Glucose +..................................
(2 marks)

1 (a) (ii) Most of the carbon dioxide that a plant uses during photosynthesis is absorbed from the air.
Give one other source of carbon dioxide for a plant.
Draw a…

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4 In this country most tomatoes are grown in greenhouses.
4 (a) Suggest one way in which a grower could increase the yield of tomatoes from plants growing in
his greenhouse.
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(1 mark)

4 (b) Large supermarkets often import tomatoes from overseas.
4 (b) (i) Suggest two reasons…

Page 6

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4 (a) (i) Suggest why the discs floated to the surface.
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(1 mark)
4 (a) (ii) Suggest the advantage of recording the time taken for the fifth disc to reach the surface,
rather than for the tenth disc.
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(1 mark)
4 (b) The students carried out…

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