Practice IB Biology Topic D4.3 Climate Change with authentic exam-style questions for both SL and HL students. This question bank focuses on the exact syllabus content for D4.3 Climate Change and mirrors Paper 1A, 1B, 2 style where relevant.
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What is the impact of lower ocean pH on coral reefs?
Understanding biological processes helps address global environmental challenges.
Describe the process of photophosphorylation in the light-dependent reactions of photosynthesis.
Outline how increased carbon dioxide concentration may affect protein synthesis in marine organisms.
Explain how climate change can disrupt photosynthesis and food webs.
Which statement describes the mechanism by which increased atmospheric carbon dioxide contributes to the enhanced greenhouse effect?
Which of the following is an example of a positive feedback cycle related to global warming?
Researchers studied the impact of increased atmospheric on global primary production and nutrient density of plants.
Image A maps the rate of GPP (gross primary production) change with rising .
Image B shows this GPP response across major biomes.
Image C shows changes in essential nutrient concentrations in crops grown at elevated (689 ppm).
Using Image A, identify two regions with the greatest increase in GPP per ppm increase in atmospheric (highest ).
Explain how GPP data reflect variations in primary production across biomes, using Image B.
Based on Image C, explain how declining plant nutrient content could reduce secondary production in food webs.
Suggest how this might affect trophic efficiency and biomass transfer in ecosystems.
Explain why the fertilization effect, although increasing GPP, might contribute to positive feedback in the climate system over time. Refer to at least two of Images A–C.
Describe one scenario in which increased plant growth might shift to a net carbon source.