School / Cambridge IGCSE / 0610 / Photosynthesis and respiration Question practice
Photosynthesis and respiration About this practice Word equations, limiting factors and gas exchange in plants.
Biology Photosynthesis and respiration
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1 Write the word equation for photosynthesis, and state the two limiting factors that most commonly reduce its rate on a cool, cloudy day. Easy 3 marks No calculator + 2 Explain why plant leaves need stomata for both photosynthesis and respiration to occur efficiently. Medium 4 marks No calculator + 3 Describe an investigation using a plant, sodium hydrogencarbonate solution, and light of varying distance to show that light intensity is a limiting factor of photosynthesis. Medium 4 marks No calculator + 4 Write the word equation for aerobic respiration, and state one difference between aerobic and anaerobic respiration in terms of the products formed. Easy 3 marks No calculator + 5 Explain the role of chlorophyll in photosynthesis, and state where in the plant cell it is located. Easy 3 marks No calculator + 6 Describe the starch test used to determine whether a leaf has photosynthesised, and explain why the leaf must first be de-starched (destarched) before an investigation. Medium 4 marks No calculator + 7 State three raw materials or conditions required for photosynthesis to occur. Easy 3 marks No calculator + 8 Explain why increasing carbon dioxide concentration increases the rate of photosynthesis only up to a certain point, beyond which the rate no longer increases. Easy 3 marks No calculator + 9 Describe the exchange of gases between a leaf and the atmosphere during the day, when both photosynthesis and respiration are occurring simultaneously. Easy 3 marks No calculator + 10 Explain why, at night, a plant releases only carbon dioxide and no oxygen into the atmosphere, even though it produced oxygen during the day. Easy 2 marks No calculator + 11 During vigorous exercise, muscle cells may not receive enough oxygen to meet their energy demands through aerobic respiration alone. Describe what happens in muscle cells under these conditions, and explain what is meant by 'oxygen debt'. Medium 4 marks No calculator + 12 Yeast can respire anaerobically in a process called fermentation. Write the word equation for this process, and state one industrial use of yeast fermentation. Easy 3 marks No calculator + 13 Describe an experiment using germinating seeds and limewater to show that respiration produces carbon dioxide, including a control needed to make the experiment valid. Medium 4 marks No calculator + 14 Describe three features of a typical leaf that adapt it for efficient photosynthesis. Easy 3 marks No calculator + 15 Describe how guard cells control the opening and closing of a stoma. Easy 3 marks No calculator + 16 Explain why the rate of respiration increases as temperature rises from 10 °C to the optimum temperature, but decreases sharply above this optimum. Easy 3 marks No calculator + 17 Describe how discs cut from a leaf can be used to investigate the rate of photosynthesis at different light intensities. Medium 4 marks No calculator + 18 State what is meant by the 'compensation point' of a plant, in terms of the rates of photosynthesis and respiration. Easy 2 marks No calculator + 19 State three uses that a plant makes of the glucose produced during photosynthesis. Easy 3 marks No calculator + 20 A graph shows the rate of photosynthesis increasing steeply with light intensity at first, then levelling off (plateauing) at higher light intensities. Explain what is limiting the rate of photosynthesis in each of these two regions of the graph. Easy 3 marks No calculator + 21 Compare photosynthesis and respiration in terms of the type of energy transfer involved and where each occurs within a plant cell. Easy 3 marks No calculator + 22 Hydrogencarbonate indicator solution is red in atmospheric air, turns yellow in a higher concentration of carbon dioxide, and turns purple in a lower concentration of carbon dioxide. A test tube containing hydrogencarbonate indicator and a green plant is left in bright light for several hours. Predict and explain the colour change observed. Easy 3 marks No calculator + 23 Explain why a person's breathing rate remains higher than normal for some time after they stop vigorous exercise. Easy 3 marks No calculator + 24 Explain why respiration occurs continuously in every living cell, both day and night, while photosynthesis only occurs in green plant cells when light is available. Easy 3 marks No calculator + 25 Explain the role of ATP as the immediate energy source in cells, linking it to the process of respiration. Easy 3 marks No calculator + Self-assessed Not marked yet
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