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WorksheetsIGCSE Biology Photosynthesis
Total questions: 16
Worksheet time: 14mins
Which of the following shows the balanced chemical symbol equation for photosynthesis?
A
B
C
D
What is the main energy change that happens in photosynthesis?
chemical --> light
light --> kinetic
light --> chemical
kinetic --> light
Where is chlorophyll found in plant cells?
cytoplasm
chloroplast
mitochondria
vacuole
What substance can glucose be converted to, which is the transport carbohydrate of plants?
starch
cellulose
sucrose
amino acids
What substance can glucose be converted into, which is the energy storage carbohydrate of plants?
cellulose
sucrose
amino acids
starch
Which substance can glucose be converted to, which strengthens plant cell walls?
starch
cellulose
amino acids
sucrose
Which of the following organelles would you not expect to be present in onion root cells?
cell wall
vacuole
chloroplast
mitochondrion
All of the definitions below are descriptions of a 'limiting factor'.
Which of these is the IGCSE Biology definition?
a factor in the environment that runs out
something present in the environment in such short supply that it restricts life processes
a factor in the environment that is in short supply
something present in the environment in such short supply that it stops life processes
Click on the picture to make it larger.
Which of the following can you conclude about point X from this graph alone?
I. light intensity limits the rate of photosynthesis
II. as light intensity increases, rate of photosynthesis increases
III. CO2 concentration limits the rate of photosynthesis
I and II only
I and III only
II and III only
I, II and III
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Which of the following can you conclude about point Y from this graph?
I. light intensity does not limit the rate of photosynthesis
II. the plant has stopped photosynthesising
III. the rate of photosynthesis could be limited by a shortage of water or CO2
I and II only
I and III only
II and III only
I, II and III
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What do curves C and D suggest is limiting the rate of photosynthesis?
light intensity
carbon dioxide concentration
temperature
water
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What do curves B and D suggest is limiting the rate of photosynthesis?
light intensity
carbon dioxide concentration
temperature
water
Supplying extra heat and carbon dioxide is more expensive, but may be worth it if the rate of photosynthesis greatly increases.
Click on the graph to make it larger.
Which of the following would it not be worth doing for a plant grower?
increasing the CO2 from 0.03% to 0.1% at a temperature of 20oC.
increasing the CO2 from 0.03% to 0.1% at a temperature of 25oC.
increasing the temperature from 20oC to 25oC at a CO2 concentration of 0.03%
increasing the temperature from 20oC to 25oC at a CO2 concentration of 0.1%
Why is the chemical sodium hydrogencarbonate given to water plants in photosynthesis practicals?
it is used to produce chlorophyll
it allows the plant to respire
it supplies the plant with CO2 gas when it dissolves
it is a source of glucose
All of the statements below are correct definitions of photosynthesis.
Which of these is the IGCSE Biology definition of photosynthesis?
the process that produces glucose and oxygen, using CO2, water, light and chlorophyll
the process that converts light energy into chemical energy
the process by which plants produce carbohydrates from raw materials using light energy
the process that converts inorganic compounds into organic compounds
Four test-tubes are set up as shown.
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Which test-tube contains the most carbon dioxide after one hour?
A
B
C
D
