1 markAn experiment is set up with four test tubes as shown in the diagram below.
All four test tubes are left in sunlight for 6 hours.
Which test tube would contain the least amount of dissolved carbon dioxide after 6 hours?
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1 markThe diagram below shows a section through a leaf.
Which cell type would have the highest concentration of oxygen on a bright, sunny day?
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1 markThe glucose molecules formed during photosynthesis have which form of energy stored within them?
Light
Heat
Chemical
Mechanical
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1 markThe diagram below shows a palisade mesophyll cell found in the leaves of plants.
In which region of the cell would starch be stored?
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1 markName the product of photosynthesis that diffuses out of a green leaf through its stomata.
Water
Oxygen
Carbon dioxide
Glucose
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1 markWhich row of the table below shows the correct effects of deficiencies of essential minerals for plant growth?
| effect of magnesium ion deficiency | effect of nitrate ion deficiency |
A | yellow leaves | stunted growth |
B | stunted growth | long roots |
C | small leaves | yellow leaves |
D | stunted growth | yellow leaves |
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1 markWhich of the following options is the best explanation for the role of chlorophyll in photosynthesis?
Chlorophyll...
transfers light energy from the Sun because it has magnesium ions
transfers chemical potential energy from sunlight into organic molecules which can be used to synthesise carbohydrates such as glucose
transfers light energy from the Sun into chemical energy in inorganic molecules which can be used for growth
transfers light energy into chemical potential energy in glucose molecules which are used in the synthesis of other carbohydrates
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1 markThe average number of chloroplasts found in four different types of cell from the leaf of a plant are shown in the bar chart below.
What are the names of the four types of cell?
| 1 | 2 | 3 | 4 |
A | spongy mesophyll cell | epidermal cell | palisade mesophyll cell | guard cell |
B | palisade mesophyll cell | guard cell | spongy mesophyll cell | epidermal cell |
C | epidermal cell | spongy mesophyll cell | palisade mesophyll cell | guard cell |
D | palisade mesophyll cell | spongy mesophyll cell | guard cell | epidermal cell |
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1 markA student sets up an experiment to measure the rate of oxygen production of an aquatic plant when it is photosynthesising.
The student repeated the experiment several times to calculate the average amount of oxygen collected.
Which two factors should be kept constant during the student’s experiment?
The size of the funnel and beaker.
The size of the aquatic plant and time exposed to light.
The size of the aquatic plant and the amount of water in the beaker.
The size of the aquatic plant and the amount of gas in the measuring cylinder.
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1 markWhich of the following correctly identifies some of the molecules produced from the glucose synthesised by photosynthesis?
| 1 | 2 | 3 |
A | cellulose for storage | fats and oils for energy storage | starch to build cell walls |
B | cellulose to build cell walls | fats and oils for energy storage | starch for storage |
C | sucrose to be transported around the plant | fats and oils for energy storage | cellulose for storage |
D | sucrose to be transported around the plant | starch to build cell walls | cellulose for storage |
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1 markThe diagram below shows how the rate of photosynthesis is affected by different conditions.
What of the following correctly identifies the limiting factor for photosynthesis at the three points on the graph?
| 1 | 2 | 3 |
A | light intensity | light intensity | carbon dioxide concentration |
B | temperature | temperature | light intensity |
C | light intensity | temperature | carbon dioxide concentration |
D | light intensity | carbon dioxide concentration | temperature |
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1 markTwo test tubes are set up with two similar leaves inside them, as shown in the diagram below.
One test tube is exposed to light, while the other is kept in the dark.
The test tubes are left for 4 hours.
What colour will the hydrogencarbonate indicator solution be in each test tube?
| dark | light |
A | purple | yellow |
B | colourless | yellow |
C | purple | colourless |
D | yellow | purple |
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1 markA student sets up a photosynthesis experiment.
A plant with striped leaves (similar to the one shown below) was kept in bright light for four hours.
A leaf was removed from the plant and treated with ethanol in hot water to remove chlorophyll before iodine was used to test for starch.
Which diagram shows the result of the test?
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1 markThe following could be used to write a balanced symbol equation for photosynthesis.
6CO2 + 6H2O
CO2 + 6H2O
Light and chlorophyll
C6H12O6 + 6O2
6C6H12O6 + 6O2
Which of the following show the correct balanced chemical equation for photosynthesis?
2 → 5 in the presence of 3
2 → 4 in the presence of 3
1 → 5 in the presence of 3
1 → 4 in the presence of 3
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1 markThe diagram below shows a cross-section through a leaf as seen under a microscope.
In which part of the leaf would the concentration of carbon dioxide be lowest on a warm, sunny day?
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