Unit 4: Continuity and Change
Topic 4.11: Stability and Change Questions
Practice 20 exam-style questions for IB Biology Topic 4.11. Review the question stems below, then unlock the full Question Bank to access markschemes, model answers, and AI grading.
1Identify1 mark
Which statement correctly defines biomagnification?
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Which process was mainly responsible for the rise of oxygen in Earth's atmosphere?
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Over geological time, living organisms changed Earth's atmosphere.
Which pair of changes did they cause?
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Which substances washing into a lake are the usual trigger for eutrophication?
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Two genetically identical organisms are raised in different environments and develop different appearances.
What is the cause of the difference?
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State the two mineral nutrients, usually carried in fertiliser run-off, that trigger eutrophication in a lake.
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State what is meant by a 'persistent' pollutant.
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State what is meant by the term phenotypic plasticity.
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Stability is referred to as an emergent property of an ecosystem.
State what is meant by an emergent property.
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Which statement best defines phenotypic plasticity?
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Which statement best describes a stable ecosystem?
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A fishery removes more fish each year than the population can replace by breeding and growth.
How is this harvest best described?
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State the process carried out by living organisms that was responsible for raising the level of oxygen in Earth's atmosphere.
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A persistent pollutant is measured at 0.05 ppm in algae, 0.9 ppm in shrimp, 6 ppm in mackerel and 40 ppm in tuna.
Which organism is most at risk, and why?
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Which statement best describes a tipping point in an ecosystem?
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The carbon removed from the atmosphere by photosynthesis was stored long-term in which two main forms?
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Which organisms were the first to add oxygen to Earth's atmosphere?
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Why must an ecosystem receive a continuous supply of energy, even though it does not need a continuous supply of new nutrient elements?
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Which best describes Earth's atmosphere before photosynthesising organisms had evolved?
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Which feature shows that a difference between organisms is due to phenotypic plasticity rather than to a genetic change?
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