Oxford AQA IGCSE · Biology (9201)

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 1

1 mark

In the chemical process of photosynthesis, light energy is absorbed by a specific green substance. What is the name of this substance and where exactly is it found within a plant cell?

Question 2

1 mark

A student investigates the rate of photosynthesis by measuring the volume of oxygen produced by an aquatic plant at different light intensities. Which equation correctly represents the chemical reaction being studied?

Question 3

1 mark

In an experiment, a plant is kept in the dark for 48 hours. After this period, one leaf is partially covered with black paper and the plant is placed in bright light for several hours. The leaf is then tested for starch. Which of the following explains the expected results in the covered versus uncovered parts of the leaf?

Question 4

1 mark

Plants produce glucose during photosynthesis. Which of the following is not a way in which the plant uses this glucose?

Question 5

1 mark

A commercial greenhouse grower decides to increase the concentration of carbon dioxide to 0.1% while maintaining a high light intensity and a temperature of \(25^{\circ}C\). Which of the following best describes the principle of limiting factors in this context?

Question 6

2 marks

State the chemical equation for photosynthesis using molecular formulas.

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Question 7

3 marks

Explain how low temperature acts as a limiting factor in the rate of photosynthesis.

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Question 8

5 marks

A plant is grown in a greenhouse where the light intensity is high and the temperature is kept at \(25^{\circ}C\), but the growth rate remains slow. Identify the likely limiting factor and explain how a farmer could economically increase the yield.

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Question 9

3 marks

(a) State the word equation for the process of photosynthesis.

(b) Name the green substance found in plant cells that is responsible for absorbing the light energy required for this process.

(c) List two ways in which the glucose produced during photosynthesis can be used by the plant, other than for immediate respiration.

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Question 10

5 marks

Photosynthesis is a chemical process essential for life on Earth, where plants convert simple inorganic substances into complex organic molecules.

(a) Write the balanced chemical equation for photosynthesis. Use MathJax for the chemical symbols and ensure subscripts are correct.

(b) The glucose produced during photosynthesis is often converted into starch for storage. Explain two reasons why plants store glucose as starch rather than keeping it as glucose.

(c) Farmers often increase the concentration of carbon dioxide in commercial greenhouses. Explain how this practice affects the yield of crops and identify one other environmental factor that might eventually limit the rate of photosynthesis if the carbon dioxide concentration is kept very high.

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