Unit 2: Form and Function
Topic 2.10: Ecological Niches Questions
Practice 20 exam-style questions for IB Biology Topic 2.10. Review the question stems below, then unlock the full Question Bank to access markschemes, model answers, and AI grading.
1State2 marks
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State two abiotic factors that characterise a hot desert biome.
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What does the competitive exclusion principle state?
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State the carbon source used by all autotrophs to build their organic molecules.
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Which of the following is an example of an abiotic factor in an ecosystem?
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An organism builds all of its organic carbon compounds from carbon dioxide.
Which mode of nutrition does this describe?
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Which interspecific relationship harms BOTH species involved?
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A fungus grows over a fallen log, secreting enzymes onto the dead wood and absorbing the digested products.
Its mode of nutrition is:
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A species' fundamental niche is best described as the range of conditions and resources it could use when:
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An owl catches, kills and eats a field mouse.
Which interspecific relationship is this, and what is the effect on the mouse?
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State the competitive exclusion principle.
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Which statement best describes the ecological niche of a species?
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State the name of the only interspecific relationship in which both species are harmed.
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Distinguish between mutualism and competition in terms of how each species is affected.
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State the difference between the habitat and the ecological niche of a species.
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Which of the following is an abiotic factor that forms part of a species' niche?
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Bacteria living in a human gut make vitamins the person can absorb, and in return the bacteria gain a warm, food-rich habitat.
Which interspecific relationship is this?
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Two snail species live on the same rocky shore, but one grazes algae high up near the splash zone and the other grazes algae lower down near the water.
This is best described as the same:
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How does the realized niche of a species compare in size with its fundamental niche?
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A species occupies a wider range of conditions when it lives alone than when a competitor is present.
The full range it could occupy with no competitors is its:
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Small fish in a shallow lake are far more abundant among submerged plants than among floating surface plants.
Which reason, linked to the fish's niche, best explains this?
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