Name the precise location of the light-independent reaction in a chloroplast.
From Mock A · Paper 2 (topics 5–8)
1.23 marks
Describe how glycerate 3-phosphate (GP) is converted to triose phosphate (TP) and how ribulose bisphosphate (RuBP) is regenerated.
From Mock A · Paper 2 (topics 5–8)
1.33 marks
Figure 1 shows the rate of photosynthesis of a plant at different light intensities and two CO₂ concentrations.
Explain the shape of the curves between 0 and 100 µmol photons m⁻² s⁻¹ and above 400 µmol photons m⁻² s⁻¹.
Figure 1
From Mock A · Paper 2 (topics 5–8)
1.42 marks
In a chromatogram of leaf pigments, a pigment travelled 3.2 cm and the solvent front travelled 8.0 cm. Calculate the Rf value and explain how it could identify the pigment.
From Mock A · Paper 2 (topics 5–8)
1.51 mark
A herbicide blocks the electron transfer chain in chloroplasts. Suggest why this kills the plant.
From Mock B · Paper 2 (topics 5–8)
1.13 marks
Describe what happens during photoionisation and photolysis in the light-dependent reaction.
From Mock B · Paper 2 (topics 5–8)
1.22 marks
Explain how ATP is produced in the thylakoid membrane by chemiosmosis.
From Mock B · Paper 2 (topics 5–8)
1.33 marks
Isolated chloroplasts were added to blue DCPIP solution. The DCPIP decolourised in the light but not in the dark. Explain these results.
From Mock C · Paper 2 (topics 5–8)
1.13 marks
Calvin supplied algae with radioactive ¹⁴CO₂ for very short times. Explain why GP was the first radioactive compound detected and TP second.
From Mock C · Paper 2 (topics 5–8)
1.23 marks
A grower raises CO₂ concentration and temperature in a greenhouse. Explain how this increases yield and why heating to very high temperatures would not help.
Score 0 / 24 · 0 of 10 marked
This paper is written by Plasmo in the style of the AQA A-Level Biology exam. It is not a past paper and is not produced or endorsed by the exam board.