AQA Biology A-Level - Photosynthesis QP
Q1.
(a) In photosynthesis, which chemicals are needed for the light-dependent
reaction?
Tick (✓) one box.
Reduced NADP, ADP, Pi, water and oxygen.
NADP, ATP and water.
Reduced NADP, ATP, water and carbon dioxide.
NADP, ADP, Pi and water.
(1)
(b) Describe what happens during photoionisation in the light-dependent
reaction.
___________________________________________________________
___________________________________________________________
___________________________________________________________
___________________________________________________________
___________________________________________________________
___________________________________________________________
___________________________________________________________
___________________________________________________________
(2)
Page 1 of 16
,AQA Biology A-Level - Photosynthesis QP
A student obtained a solution of pigments from the leaves of a plant. Then the
student used paper chromatography to separate the pigments.
The diagram shows the chromatogram produced.
(c) Explain why the student marked the origin using a pencil rather than using
ink.
___________________________________________________________
___________________________________________________________
___________________________________________________________
(1)
(d) Describe the method the student used to separate the pigments after the
solution of pigments had been applied to the origin.
___________________________________________________________
___________________________________________________________
___________________________________________________________
___________________________________________________________
___________________________________________________________
___________________________________________________________
(2)
Page 2 of 16
, AQA Biology A-Level - Photosynthesis QP
(e) Calculating the Rf values of the pigments can help to identify each pigment.
An Rf value compares the distance the pigment has moved from the origin
with the distance the solvent front has moved from the origin.
The distance each pigment has moved is measured from the middle of
each spot.
Pigment A has an Rf value of 0.95
Use the diagram above to calculate the Rf value of pigment C.
Rf value of pigment C = _________________________
(1)
(f) The pigments in leaves are different colours. Suggest and explain the
advantage of having different coloured pigments in leaves.
___________________________________________________________
___________________________________________________________
___________________________________________________________
___________________________________________________________
(1)
(Total 8 marks)
Page 3 of 16
Q1.
(a) In photosynthesis, which chemicals are needed for the light-dependent
reaction?
Tick (✓) one box.
Reduced NADP, ADP, Pi, water and oxygen.
NADP, ATP and water.
Reduced NADP, ATP, water and carbon dioxide.
NADP, ADP, Pi and water.
(1)
(b) Describe what happens during photoionisation in the light-dependent
reaction.
___________________________________________________________
___________________________________________________________
___________________________________________________________
___________________________________________________________
___________________________________________________________
___________________________________________________________
___________________________________________________________
___________________________________________________________
(2)
Page 1 of 16
,AQA Biology A-Level - Photosynthesis QP
A student obtained a solution of pigments from the leaves of a plant. Then the
student used paper chromatography to separate the pigments.
The diagram shows the chromatogram produced.
(c) Explain why the student marked the origin using a pencil rather than using
ink.
___________________________________________________________
___________________________________________________________
___________________________________________________________
(1)
(d) Describe the method the student used to separate the pigments after the
solution of pigments had been applied to the origin.
___________________________________________________________
___________________________________________________________
___________________________________________________________
___________________________________________________________
___________________________________________________________
___________________________________________________________
(2)
Page 2 of 16
, AQA Biology A-Level - Photosynthesis QP
(e) Calculating the Rf values of the pigments can help to identify each pigment.
An Rf value compares the distance the pigment has moved from the origin
with the distance the solvent front has moved from the origin.
The distance each pigment has moved is measured from the middle of
each spot.
Pigment A has an Rf value of 0.95
Use the diagram above to calculate the Rf value of pigment C.
Rf value of pigment C = _________________________
(1)
(f) The pigments in leaves are different colours. Suggest and explain the
advantage of having different coloured pigments in leaves.
___________________________________________________________
___________________________________________________________
___________________________________________________________
___________________________________________________________
(1)
(Total 8 marks)
Page 3 of 16
