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IB Biology Topic D4.3 Climate Change Questionbank… | RevisionDojo

IB
D4.3 Climate change

IB Biology Topic D4.3: Climate Change Questionbank

D1.1 DNA replication

D1.2 Protein synthesis

D1.3 Mutations and gene editing

D2.1 Cell and nuclear division

D2.2 Gene expression (HL)

D2.3 Water potential

D3.1 Reproduction

D3.2 Inheritance

D3.3 Homeostasis

D4.1 Natural selection

D4.2 Sustainability and change

D4.3 Climate change

Paper

Level

Question

HLPaper 1A

What is the impact of lower ocean pH on coral reefs?

Increased resilience of corals

Enhanced coral reproduction

Difficulty for corals to form calcium carbonate skeletons

Increased nutrient availability

Question

HLPaper 2

Understanding biological processes helps address global environmental challenges.

(a)

Describe the process of photophosphorylation in the light-dependent reactions of photosynthesis.

[4]

(b)

Outline how increased carbon dioxide concentration may affect protein synthesis in marine organisms.

[4]

(c)

Explain how climate change can disrupt photosynthesis and food webs.

[7]

SLPaper 1A

Which statement describes the mechanism by which increased atmospheric carbon dioxide contributes to the enhanced greenhouse effect?

SL & HLPaper 1A

Which of the following is an example of a positive feedback cycle related to global warming?

SLPaper 2

Researchers studied the impact of increased atmospheric $CO_2$ on global primary production and nutrient density of $C_3$ plants.

IB Biology Topic D4.3 Climate Change Questionbank

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.

Get instant solutions, detailed explanations, and build confidence with questions aligned to IB examiner expectations.

3

Image A maps the rate of GPP (gross primary production) change with rising $CO_2$ .

Image B shows this GPP response across major biomes.

Image C shows changes in essential nutrient concentrations in crops grown at elevated $CO_2$ (689 ppm).

(a)

Using Image A, identify two regions with the greatest increase in GPP per ppm increase in atmospheric $CO_2$ (highest $\partial GPP/\partial c_a$ ).

[1]

(b)

Explain how GPP data reflect variations in primary production across biomes, using Image B.

[3]

(c)

Based on Image C, explain how declining plant nutrient content could reduce secondary production in food webs.

[2]

(d)

Suggest how this might affect trophic efficiency and biomass transfer in ecosystems.

[2]

(e)

Explain why the $CO_2$ 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.

[3]

(f)

Describe one scenario in which increased plant growth might shift to a net carbon source.

[2]

1

2

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They decrease the amount of solar radiation reflected by the atmosphere.

They absorb and re-emit long-wave infrared radiation towards Earth's surface.

They deplete the stratospheric ozone layer, allowing more ultraviolet radiation through.

They increase the heat capacity of the atmosphere, retaining more heat.

Decrease in ice melt due to cooling

Increase in forest cover in polar regions

Accelerated ice melt due to lower albedo

Reduction in water vapour concentration

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