Practice IB Biology Topic C1.3 Photosynthesis with authentic exam-style questions for both SL and HL students. This question bank focuses on the exact syllabus content for C1.3 Photosynthesis and mirrors Paper 1A, 1B, 2 style where relevant.
Get instant solutions, detailed explanations, and build confidence with questions aligned to IB examiner expectations.
Which row correctly matches the photosynthesis inputs and outputs?
| Reactants | Products |
|---|---|
| A. CO₂ and H₂O | Glucose and oxygen |
| B. Glucose and oxygen |
Understanding biological processes helps address global environmental challenges.
| CO₂ and H₂O |
| C. CO₂ and glucose | H₂O and light |
| D. H₂O and lactic acid | Oxygen and ATP |
(a) the process of photophosphorylation in the light-dependent reactions of photosynthesis.
(b) how increased carbon dioxide concentration may affect protein synthesis in marine organisms.
(c) how climate change can disrupt photosynthesis and food webs.
In an experiment investigating the effect of light intensity on oxygen bubbles min⁻¹, which factor should be controlled?
Why do chlorophyll molecules absorb specific wavelengths of light?
Which option best explains the relative positions of the pigment bands after the chromatography run?
Row A
Row B
Row C
Row D
Time between measurements
Temperature of the water
Rate of bubble formation
Concentration of carbon dioxide
Their molecular structure has electrons that absorb photons only of certain energies.
They absorb only wavelengths that can be converted directly into heat energy.
Electron excitation occurs only at specific energy levels.
They absorb wavelengths complementary to the colour they reflect.
Carotene is the most polar pigment, so it remains closest to the origin.
Chlorophyll b travels farthest due to its small molecular size.
Xanthophyll travels further than chlorophylls but less than carotene due to intermediate polarity.
Chlorophyll a is non-polar and thus moves ahead of all pigments with the solvent.
