Curriculum
Course: AQA A Level Biology 7402
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AQA A Level Biology 7402

1. Biological Molecules

0/102

2. Cell Structure

0/95

3. Exchange and Transport

0/98

4. Genetics, Variation and Interdependence

0/94

5. Energy Transfers In and Between Organisms (A Level only)

0/63

6. Organisms Respond to Changes in their Environments (A Level only)

0/93

7. Genetics, Populations, Evolution and Ecosystems (A Level only)

0/55

8. The Control of Gene Expression (A Level only)

0/72

9. Exam Guidance and Skills

0/38
Quiz

5.1.5 Required Practical- Investigating the Rate of Photosynthesis – Exam questions

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  • Questions count: 12
  • Passing grade: B+
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1.

Which factor can limit the rate of photosynthesis?

Light intensity
Oxygen concentration (high)
Nitrogen gas
Soil colour
2.
Rate of photosynthesis at two CO₂ levels is shown. At what light intensity does CO₂ become the limiting factor at 0.04% CO₂?
Below 10 units
At 0 units
Above about 30 units of light
CO₂ is never limiting
3.
A graph shows photosynthesis rate rising with light intensity and then leveling off. The plateau is best explained by
another factor such as CO2 becoming limiting
chlorophyll being destroyed
the plant switching to respiration
stomata absorbing too much light
4.
In a photosynthesis investigation, the rate can be measured by counting:
Roots
Flowers
Bubbles of oxygen per minute
Leaves on the plant
5.
How could the ecologist calculate the rate of photosynthesis in the pond water?
SAT Biology - Question 077
A
B
C
D
E
6.
Using the pondweed table, what happens to the rate as the lamp moves from 10 cm to 20 cm?
It rises from 30 to 48
It falls from 48 to 30 bubbles per minute
It stays the same
It doubles
7.
Using the same CO₂ table, by how much does increasing CO₂ from 0.04% to 0.1% raise the rate at light intensity 50?
38 units
22 units
6 units
16 units
8.
On the graph, what limits the rate of the lower curve at high light intensity?
Dr Dabour Hub Academy - figure 1
Light intensity
Chlorophyll colour
CO₂ concentration
Oxygen
9.
From the graph, why does the rate fall above 30 °C?
Dr Dabour Hub Academy - figure 2
Light intensity falls
CO₂ increases
Enzymes of the Calvin cycle begin to denature
Chlorophyll turns red
10.
A graph of rate against light intensity levels off. The best explanation is:
Chlorophyll is destroyed
Another factor, such as CO2, is now limiting
The plant is dead
Light is no longer absorbed
11.
In an experiment on the effect of light intensity on photosynthesis rate, the dependent variable is:
light intensity
temperature
type of plant
rate of O2 production
12.
Increasing light always increases the rate of photosynthesis. True or false?
False
True
True in greenhouses
True at night
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Part of 5. Energy Transfers In and Between Organisms (A Level only) — see every lesson and quiz in this unit.
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