carbon dioxide +... (+ light energy) glucose +...
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1 Photosynthesis 1. (i) Complete the word equation for photosynthesis. (ii) carbon dioxide +... (+ light energy) glucose +... 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 A student investigated the conditions that plants need for photosynthesis. The leaves of the plant he used had green and white parts. Diagram 1 shows how part of one leaf was covered in black (opaque) card. The plant was placed in a warm, sunny area and was watered well. Eight hours later the leaf was removed from the plant and was tested for starch. The results of the test are shown in Diagram, the shaded parts show where starch was present. Diagram 1 Diagram Name the two independent variables in this investigation. (c) Why was no starch found in: (i) the part of the leaf labelled A Page 1 of 6
2 (ii) the part of the leaf labelled B? (Total 7 marks). The graph shows the effect of temperature on photosynthesis Rate of photosynthesis (arbitrary units) (c) Temperature (ºC) Between which temperatures is the rate of photosynthesis fastest?... and... C Suggest why the rate of photosynthesis stays the same between these two temperatures. A greenhouse owner wants to grow lettuces as quickly and cheaply as possible in winter. At what temperature should he keep his greenhouse in order to grow the lettuces as quickly and cheaply as possible? Explain your answer.... C (3) (Total 6 marks) Page of 6
3 3. The graph shows the concentration of carbon dioxide in the air in a greenhouse full of tomato plants, measured over a period of 4 hours. Increased concentration of carbon dioxide X Y Z 0 mid night 6 dawn 1 midday Time in hours 18 dusk Explain why the concentration of carbon dioxide in the air in the greenhouse increased between X and Y. 4 mid night Explain why the concentration of carbon dioxide in the air in the greenhouse decreased between Y and Z. (Total 4 marks) Page 3 of 6
4 4. 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. Lighting unit Lettuce plant Propagator Nutrient solution in Nutrient solution out The graph shows the effects of changing the temperature, light intensity and carbon dioxide concentration on the growth of lettuce plants % CO, 5 C 300 4% CO, 15 C Mean mass of lettuce plants after 1 days in grams % CO, 5 C 0.03% CO, 15 C Light intensity in arbitrary units Describe and explain the effect of increasing light intensity on the mean mass of lettuce plants at 4% carbon dioxide and 15 C. (3) Page 4 of 6
5 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? 5. Low light intensity is one factor that limits the yield of a crop. In Britain, many tomato growers use artificial lights to increase the yield of tomato crops. The table shows the amount of natural daylight and artificial lamplight received by a tomato crop grown in a greenhouse. Month Natural daylight received by tomato plant Day length in hours Light energy received by plant per day in J/cm Artificial lamplight given to tomato plant Hours of light given per day Light energy received by plant per day in J/cm Total light energy received by plant per day in J/cm (Total 5 marks) Percentage increase in growth resulting from artificial light January February March April May June July August September October November December Describe the pattern for the amount of light energy received from natural daylight by a tomato plant during the day. (3) Page 5 of 6
6 A tomato plant needs 600 J of light energy per cm each day to grow and produce tomatoes. Use this information and data from the table to suggest an explanation for the pattern of the artificial light given to the tomato plants. (Total 5 marks) Page 6 of 6
Draw a ring around the correct answer to complete each sentence. The energy needed for photosynthesis comes from
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