IB Biology HL 8.3.2 Photosynthesis investigations Question Bank

Practise IB Biology HL 8.3.2 by evaluating carbon-dioxide, pH and control evidence from photosynthesis investigations.

Exam points

Evaluate controls and indicator data to infer carbon-dioxide uptake and photosynthetic activity.
Explain how experimental evidence links increased photosynthesis with carbon-dioxide removal and pH change.

[Maximum number: 1]

Bromothymol blue is an indicator that is initially blue and turns yellow when $\mathrm{CO}_{2}$ is present. Tests were carried out varying the presence of a plant (Elodea canadensis) and a snail (Marisa cornuarietis) in an aquatic environment. What condition would produce a blue colour after sampling the water?

Plant kept in the dark without snail

Plant and snail kept in the dark

Plant kept in the light without snail

Snail with no plant

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C1.3.2—CO₂ → glucose question 1