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IB Biology SL C1.3 Photosynthesis Question Bank

Practise IB Biology SL C1.3 by explaining light energy conversion, pigment evidence, wavelength spectra and limiting-factor experiments.

Syllabus
First assessment 2025
Course
Biology SL
Level
SL

Exam points

  • explain conversion of light energy into chemical energy and use of carbon dioxide to make carbon compounds
  • separate and identify pigments using chromatography and calculate Rf values from measured distances
  • interpret absorption, action or rate graphs to identify useful wavelengths and limiting factors

Covered syllabus points

C1.3.1—Light energy → chemical energyC1.3.2—CO₂ → glucoseC1.3.3—Oxygen as by-productC1.3.4—Photosynthetic pigment separationC1.3.5—Absorption of specific wavelengthsC1.3.6—Absorption vs. action spectraC1.3.7—Limiting factors investigationC1.3.8—CO₂ enrichment experiments

C1.3 Photosynthesis question 1

[Maximum number: 5]

Describe how leaf cells make use of light energy.

C1.3 Photosynthesis question 2

[Maximum number: 4]

Outline the production of carbohydrates in photosynthesis.

C1.3 Photosynthesis question 3

[Maximum number: 1]

A photosynthesis experiment was carried out using an aquatic plant. The image shows the contents of the test tube after being exposed to light and room temperature for 30 minutes.

Figure for Question C1.3 Photosynthesis question 3 — IB Biology SL

What explains the presence of bubbles?

A

Oxygen is formed when carbon dioxide combines with chlorophyll.

B

Carbon dioxide is formed during the light-dependent reaction.

C

Oxygen is released when light splits water molecules in chloroplasts.

D

Carbon dioxide is released from dissociation of sodium hydrogen carbonate.

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