Photosynthesis — Question Bank (Cambridge) — Cambridge IGCSE Physics 0625 Revision Notes & Topical Questions

Cambridge Lower Secondary Stage 9

Question 1
Paper Ref: 0610/22_Summer_2023_Q12

The diagram shows an experiment investigating the effect of light intensity on an aquatic plant.
<— light
<«— SOUICE
Photosynthesis occurred in both test-tube P and test-tube Q. Both test-tubes were kept at the
same temperature. The number of bubbles produced in test-tube P was 12 bubbles per minute.
What is the most likely number of bubbles produced in one minute in test-tube Q?
A 0 B 3 C 12 D 48

Options:
A
B
C
D
Correct Key: C

Question 2
Paper Ref: 0610/22_Winter_2019_Q10

The diagram shows an experiment to investigate the effect of increasing light intensity on the rate
of photosynthesis in an aquatic plant.
The rate is found by measuring the rate of bubble release by the plant.
As the light intensity increases, the rate of bubble release increases and then becomes constant.
Which statement describes why the rate of bubble release becomes constant at high light intensities?
Carbon dioxide concentration becomes a limiting factor.
Light intensity becomes a limiting factor.
Oxygen availability becomes a limiting factor.
0 0O wD FY
Water availability becomes a limiting factor.

Options:
A
B
C
D
Correct Key: D

Question 3
Paper Ref: 0610/21_Summer_2024_Q10

The diagram shows an experiment investigating the effect of light intensity on an aquatic plant.
<— light <— light
~<«— source ~«— source
Photosynthesis occurred in both test-tube P and test-tube Q. Both test-tubes were kept at the
same temperature. The number of bubbles produced in test-tube P was 12 bubbles per minute.
What is the most likely number of bubbles produced in one minute in test-tube Q?
A 0 B 3 C 12 D 48

Options:
A
B
C
D
Correct Key: A

Question 4
Paper Ref: 0610/23_Winter_2023_Q12

The diagram shows a cell with groups of bacteria around its edge.
cell cytoplasm
spiral-shaped
chloroplast
a bacteria
The bacteria move to areas of high oxygen concentration.
Which process in the cell causes the bacteria to form these groups?
A
B
c
D
digestion
photosynthesis
reproduction
respiration

Options:
A
B
C
D
Correct Key: D

Question 5
Paper Ref: 0610/21_Summer_2022_Q12

The diagram shows a cell with groups of bacteria around its edge.
cell cytoplasm
spiral-shaped
chloroplast
a bacteria
The bacteria move to areas of high oxygen concentration.
Which process in the cell causes the bacteria to form these groups?
digestion
B photosynthesis
C reproduction
D respiration

Options:
A
B
C
D
Correct Key: B

Question 6
Paper Ref: 0610/23_Summer_2020_Q11

How do the air spaces in the spongy mesophyll of a leaf help to adapt it for photosynthesis?
They act as a store of oxygen.
B- They allow carbon dioxide gas to diffuse through the leaf more rapidly.
C_ They increase the surface area for absorption of light energy.
D_ They let rainwater enter the leaf tissues.

Options:
A
B
C
D
Correct Key: C

Question 7
Paper Ref: 0610/23_Winter_2025_Q10

Which process does not release carbon dioxide to the atmosphere?
oO W
decomposition of animals
photosynthesis of plants
respiration of animals
respiration of plants

Options:
A
B
C
D
Correct Key: B

Question 8
Paper Ref: 0610/22_Spring_2024_Q13

The diagram shows how the rate of photosynthesis varies with light intensity.
The four curves show different conditions of temperature and carbon dioxide concentration.
30°C, 0.2% CO,
te of 20°C, 0.2% CO,
rate o
photosynthesis 30°C, 0.1% CO,
20°C, 0.1% CO,
light intensity
What limits the rate of photosynthesis at point P?
carbon dioxide
light intensity temperature
concentration
A
J key
x /=yes
J xX =no
x

Options:
A
B
C
D
Correct Key: C

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