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IB Biology HL 1.3.8 CO2 enrichment experiments Question Bank

Practise IB Biology HL 1.3.8 by evaluating CO2 enrichment evidence and judging how free-air experiments represent future photosynthesis.

Syllabus
First assessment 2025
Course
Biology HL
Level
HL

Exam points

  • Evaluate CO2 evidence by separating carbon-dioxide effects from temperature and judging FACE realism.
  • Explain why free-air CO2 enrichment can represent future photosynthesis more accurately than controlled trials.

C1.3.8—CO₂ enrichment experiments question 1

[Maximum number: 1]

What is an advantage of free-air carbon dioxide enrichment experiments (FACE)?

A

The carbon dioxide uptake by plants is controlled.

B

Temperature can be controlled.

C

Water can be controlled.

D

Data can more accurately represent future rates of photosynthesis.

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