Quiz on Photosynthesis
[18 marks]
1.
Why do leaves of plants look green?
A.
Most of the green light is absorbed by chlorophyll and most of the red and blue light is
reflected.
B.
Most of the blue light is absorbed by chlorophyll and most of the red and green light is
reflected.
C.
Most of the red light is absorbed by chlorophyll and most of the green and blue light is
reflected.
D.
Most of the red and blue light is absorbed by chlorophyll and most of the green light is
reflected.
(Total 1 mark)
2.
What is needed in photosynthesis to convert carbon dioxide into organic molecules?
A.
Light and hydrogen from the splitting of water
B.
Light and oxygen from the splitting of water
C.
ATP and hydrogen from the splitting of water
D.
ATP and oxygen from the splitting of water
(Total 1 mark
3.
What conclusion can be drawn from examining the action spectrum for a green plant shown below?
A.
Yellow light is the most effective at promoting photosynthesis.
B.
Every colour of light is equally effective at promoting photosynthesis.
C.
Light of wavelength 550 nm is least effective at promoting photosynthesis.
D.
Light in the green range is the most effective at promoting photosynthesis.
(Total 1 mark)
4. Which graph shows the effect of increasing carbon dioxide concentration (CO2) on the rate of
photosynthesis?
A.
B.
C.
D.
5.
What is the source of the oxygen released into the air as a product of photosynthesis?
A.
Chlorophyll
B.
Carbon dioxide only
C.
Water only
D.
Both water and carbon dioxide
(Total 1 mark)
6. Why is the action spectrum for photosynthesis similar to the absorption spectra of photosynthetic
pigments?
A.
Photosynthetic pigments have the same optimum temperature as the enzymes used in
photosynthesis.
B.
Plants absorb the same photosynthetic pigments for use in photosynthesis.
C.
Only wavelengths of light absorbed by pigments can be used in photosynthesis.
D.
The amount of energy absorbed by photosynthetic pigments is equal to the activation energy for
photosynthesis.
(Total 1 mark
7.
A plant is exposed to increasing light intensity from very dim to bright light, while the carbon dioxide
concentration and temperature are kept at an optimum level. What will happen to the rate of oxygen
production?
A.
It will increase exponentially.
B.
It will remain constant.
C.
It will decrease to a minimum level.
D.
It will increase to a maximum level.
(Total 1 mark)
8.
(a) Outline how light energy is used and how organic molecules are made in photosynthesis.
(5)
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(b)
Outline the role of chlorophyll and the effects of temperature, light intensity and carbon dioxide
concentration on the rate of photosynthesis.
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(6)