Question 1
1 markWhich of the following are the primary products of the light-dependent reaction of photosynthesis that are subsequently used in the light-independent reaction?
Oxford AQA International A-level · Biology (9610)
Photosynthesis: Practice Questions
5 multiple-choice questions marked as you go, and 5 written questions with worked solutions. All on Photosynthesis.
10 questions23 marksFree, no account
Question 2
1 markAn experiment was conducted to investigate the rate of photosynthesis in a water plant. At a constant temperature of \(25^{\circ}C\) and high light intensity, the rate of photosynthesis was found to increase significantly when the concentration of carbon dioxide was raised from \(0.01\%\) to \(0.04\%\).
What was the limiting factor at \(0.01\%\) carbon dioxide?
Question 3
1 markWhen a chlorophyll molecule in photosystem II (PSII) absorbs light energy and loses an electron, it becomes positively charged. How is this electron deficiency specifically neutralized to allow the light-dependent reaction to continue?
Question 4
1 markWhich of the following describes the exact location within the chloroplast where the light-independent reaction of photosynthesis takes place?
Question 5
1 markDuring the light-independent stage of photosynthesis, how many molecules of ATP and reduced NADP are required specifically for the reduction of the glycerate 3-phosphate (GP) molecules necessary to produce one molecule of glucose?
Question 6
3 marksIn the light-dependent reaction of photosynthesis, light energy is absorbed by chlorophyll. Describe how the absorption of this energy leads to the generation of ATP.
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Question 7
3 marksExplain how the movement of protons across the thylakoid membrane leads to the synthesis of ATP, and identify the specific enzyme responsible for this process.
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Question 8
5 marksExplain the significance of the photolysis of water in maintaining the continuous flow of electrons through the electron transfer chain during the light-dependent reaction.
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Question 9
3 marksThe enzyme rubisco plays a critical role in the Calvin cycle.
(a) State the precise location of rubisco within the chloroplast. (1 point)
(b) Describe the reaction catalyzed by rubisco, identifying the substrates and the immediate product formed. (2 points)
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Question 10
4 marksTemperature is a significant limiting factor for the rate of photosynthesis.
Explain why the rate of the light-independent reaction increases as the temperature rises from \(15^{\circ}C\) to \(30^{\circ}C\), but then decreases rapidly if the temperature exceeds \(45^{\circ}C\).
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