Questions About Plants

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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 lettuce plants.
6 (a) Describe and explain the effect of increasing light intensity on the mean mass of lettuce plants
at 4 % carbon dioxide and 15 °C.
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(3 marks)
6 (b) Growers wish to make maximum profits from their lettuces.
What do they need to consider before making decisions about the growing conditions for their
lettuces?
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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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7 A student investigated the effect of magnesium salts on the production of grain by wheat
plants kept at different light intensities.
He planted 15 wheat seeds in each of 10 pots of similar soil. Each pot contained one of two different
concentrations of magnesium salts. He kept all the pots well watered.…read more

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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 intensity received by wheat crops in Britain is 30 arbitrary units.
Farmers are advised to add enough magnesium fertiliser to the soil to give a magnesium
concentration of 0.…read more

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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 ring around your answer.
The Soil.
Respiration in the Plant.
Osmosis in the Plant Water.
(1 mark)
A student investigated the conditions that plants need for photosynthesis.…read more

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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 why a supermarket might decide to import tomatoes rather
than buy them from British growers.
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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 their experiments at different light intensities.
The graph shows the results they collected.
4 (b) (i) Compare the rate of photosynthesis for flat wrack with the rate for saw wrack at different
light intensities.
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