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 markWhich statement correctly describes why plants are called primary producers?
They release oxygen into the atmosphere
They use chemical energy from the sun to produce glucose
They release heat energy during photosynthesis
Energy stored in the biomass of plants makes its way through the food chain
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1 markThe process of photosynthesis happens in two main stages.
Which row accurately describes each stage?
| Stage 1 | Stage 2 | |
| A |
Energy from light splits water into oxygen gas and hydrogen ions |
Carbon dioxide combines with hydrogen ions to make glucose |
| B |
Carbon dioxide combines with water |
Glucose is made and oxygen released |
| C |
Carbon dioxide is taken into the leaf through stomata |
Energy from light is used to combine carbon dioxide with hydrogen |
| D |
Energy from light splits carbon dioxide into carbon and oxygen atoms |
Water combines with the carbon and oxygen atoms to make glucose |
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1 markThe following experimental set-up is used to measure the rate of oxygen production of an aquatic plant from photosynthesis.
The experiment was repeated several times and the mean volume of oxygen collected was determined.
Which two factors should be kept constant during the experiment?
The size of the funnel and temperature of the water.
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.
The distance from the light source and size of the aquatic plant.
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1 markThe diagram below shows the results of three experiments to measure the rate of photosynthesis under different conditions.
Experiment 1 measured the effect of light intensity on photosynthesis
Experiment 2 measured the effect of temperature on photosynthesis
Experiment 3 measured the effect of carbon dioxide on photosynthesis
Which of the following correctly identifies the limiting factor for photosynthesis in each experiment?
| 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 markThe graph shows the effect of carbon dioxide concentration on the rate of photosynthesis.
Where on the graph is carbon dioxide a limiting factor?
X only
X and Y
Y and Z
Z only
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1 markThe inverse square law in relation to light intensity (i) and distance (d) from the light source is shown by:
i ∝ d2
i ∝ 1/d2
i2 ∝ 1/d
i2 ∝ d
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1 markA light source is placed 0.5m from a plant. The relative light intensity falling on the plant is 2 units.
The light source is moved to 1m away.
What is the relative light intensity falling on the plant now?
0.125
0.25
0.5
1.0
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