WorksheetsIB Biology Photo
Total questions: 40
Worksheet time: 30mins
Which process is common to photosynthesis and cell respiration?
Photolysis
The Calvin cycle
The Krebs cycle
Chemiosmosis
The diagram shows the structure of a chloroplast.
Where is chlorophyll located?
A
B
C
D
ATP is needed to change products of the carboxylation of ribulose bisphosphate into triose phosphate.
What other substance is also needed?
Rubisco
NADP
NAD
Reduced NADP
What is reduced by Photosystem I ?
ADP
NADP
NAD
FAD
Which process occurs during the light-dependent reaction of photosynthesis?
ATP, CO2 and H2O are produced.
CO2 is used to produce carbohydrates.
ATP and O2 are produced.
RuBP is phosphorylated.
Which technological advance enabled Calvin to perform his lollipop experiment on the light-independent reactions of photosynthesis in 1949?
Methods for tracing radioactive carbon incorporated in molecules produced by the alga Chlorella
Development of electron microscopes enabling the molecules produced by the alga Scenedesmus to be viewed
Methods for changing the wavelength of light shining on the alga Scenedesmus contained in the lollipop
Development of X-ray diffraction techniques enabling the molecules produced by the alga Chlorella to be identified
What is used to reduce NADP in the light-dependent reactions of photosynthesis?
Conversion of ATP into ADP+Pi
Electrons from Photosystem I
Protons from the thylakoid space
Oxygen released by photolysis of water
The electron micrograph shows part of a plant cell.
Where do the light-independent reactions of photosynthesis take place?
A
B
C
D
Which molecule would first contain 14C if the alga Chlorella was grown in the presence of light and radioactive CO2?
Glycerate 3-phosphate
Glucose
Rubisco
Ribulose bisphosphate (RuBP)
The image shows a chloroplast.
During photosynthesis, what happens in the chloroplast at the location labelled lumen?
Protons accumulate.
Pyruvate undergoes decarboxylation.
NADH is oxidized.
Oxygen is produced.
What products of the light-dependent reactions are used in the light-independent reactions?
ATP and NADPH
NADPH and ribulose bisphosphate (RuBP)
CO2 and ATP
ATP and O2
What process occurs during the light-independent reactions of photosynthesis?
Oxygen is released into the atmosphere.
Protons are pumped from the thylakoid space to the stroma.
RuBP is carboxylated then regenerated in the Calvin cycle.
Triose phosphate is converted to glycerate 3-phosphate.
Where is ATP synthase located?
A
B
C
D
Where is chlorophyll found in a plant cell?
Thylakoid membranes
Stroma
Matrix
Cristae
Where are the light-dependent and light-independent reactions taking place in the diagram?
A
B
C
D
What happens in the light-independent reactions of photosynthesis?
Splitting of water molecules
ATP synthesis
Reduction of NADP
Reduction of CO2
Where are complex carbohydrates made in the chloroplast?
In the intermembrane space
In the stroma
On the inner membrane
In the thylakoid space
What reaction, involving glycerate 3-phosphate, is part of the light-independent reactions of photosynthesis?
Glycerate 3-phosphate is carboxylated using carbon dioxide.
Two glycerate 3-phosphates are linked together to form one hexose phosphate.
Glycerate 3-phosphate is reduced to triose phosphate.
Five glycerate 3-phosphates are converted to three ribulose 5-phosphates.
What is the advantage of having a small volume inside the thylakoids of the chloroplast?
High proton concentrations are rapidly developed.
High electron concentrations are rapidly developed.
Photosynthetic pigments are highly concentrated.
Enzymes of the Calvin cycle are highly concentrated.
The diagram below summarizes the light-dependent reactions in photosynthesis.
What is occurring at X?
ADP + phosphate --> ATP
NADP --> NADPH + H+
H2O --> O2– + 2H+
NADPH + H+ --> NADP
What is the first identifiable product of carbon dioxide fixation in photosynthesis?
Ribulose bisphosphate (RuBP)
Glycerate-3-phosphate (GP)
Triose phosphate (TP)
Acetyl CoA
How is the proton gradient generated in chloroplasts during photosynthesis?
Flow of electrons from carrier to carrier in the thylakoid membrane causes pumping of protons across the thylakoid membrane.
Light causes protons to flow through protein channels in the thylakoid membrane.
Light splits water molecules in the stroma, causing the release of protons.
Protons are pumped across the thylakoid membrane using energy from ATP.
The diagram shows the light independent stage of photosynthesis (the Calvin Cycle).
Where is energy, from ATP generated during the light dependent stage, used in this cycle?
I and II only
I and III only
II and III only
I, II and III
What substance is moved into the thylakoids of the chloroplast using energy derived from light?
Carbon dioxide (CO2 )
Protons (H+)
Glycerate 3-phosphate (GP)
Adenosine triphosphate (ATP)
In the light-dependent stage, what happens immediately after light hitting PSII?
electrons are excited
H+ are pumped across the thylakoid membrane
photolysis of water
synthesis of ATP
In the light-dependent stage, electrons from PSII travel along electron carriers and slow down.
What is the energy released from this directly used to do?
produce ATP
photolysis of water
produce NADPH
pump protons outside the thylakoid membrane
In the light-dependent stage, what is the energy in the proton concentration gradient used for?
photolysis of water
production of NADPH
production of oxygen
production of ATP
Where in the chloroplast is water split by photolysis?
stroma
inner chloroplast membrane
outer chloroplast membrane
thylakoid space
In the light-dependent stage, water is split into 2e- + 2H+ + O2.
What happens to these electrons?
they enter photosystem I (PSI)
they enter photosystem II (PSII)
they help to form water
they travel along electron carriers
In the light-dependent stage, water is split into 2e- + 2H+ + O2.
What happens to the protons (H+) that are produced?
they combine with oxygen to form water
they make the stroma more acidic for enzymes to work
they are used in the proton concentration gradient
they help electrons to move along the carriers
In the light-independent stage, what is the 'carbon dioxide acceptor molecule'?
glycerate-3-phosphate
RuBISCO
ribulose bisphosphate (RuBP)
triose phosphate
In the light-independent stage, what speeds up the formation of the unstable six carbon compound?
ribulose bisphosphate
carbon dioxide
RuBISCO
glyerate-3-phosphate
In the light-independent stage, during which of the following reactions are both ATP and NADPH used?
triose phosphate --> glucose
ribulose phosphate + carbon dioxide --> unstable 6C compound
glycerate-3-phosphate --> triose phosphate
unstable 6C compound --> glycerate-3-phosphate
In the light-independent stage what happens to 5/6 of the triose phosphate?
it is used to regenerate ribulose bisphosphate (RuBP)
it is converted to glucose
it is stored as starch
it is converted backl to glycerate-3-phosphate
In the light-independent stage what happens to 1/6 of the triose phosphate?
it is used to regenerate ribulose bisphosphate (RuBP)
it is converted to glucose
it is converted to triose phosphate
it is converted back to glycerate-3-phosphate
In a chloroplast where are the enzymes of the Calvin cycle located?
Thylakoid membranes
Stroma
Grana
Outer membrane of chloroplast
In the light-dependent reactions of photosynthesis what supplies lower energy electrons to photosystem II (PSII)?
Photolysis of water
Reduction of NADP+
Chemiosmosis
Photosystem I
How is oxygen produced during photosynthesis?
Water molecules are split using energy from ATP.
Water molecules are split using energy from light.
Carbon dioxide molecules are split using energy from ATP.
Carbon dioxide molecules are split using energy from light.
The diagram below shows the structure of a chloroplast.
What is X?
Ribosome
Stroma
Inner membrane
Thylakoid
In which order are the following substances produced in the light-independent reactions of photosynthesis?
I. triose phosphate
II. glycerate-3-phosphate
III. ribulose bisphosphate (RuBP)
II --> I --> III
II --> III --> I
III --> I --> II
III --> II --> I
