EcologyAQA GCSE Biology (8461)

Adaptations, Interdependence and Competition

Work through the notes, try the practice questions, then take the quiz. The report tells you exactly what to revise next. (2026)

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1
Which of the following describes a community?
Answer & explanation
Correct: option B
A community is all the populations of all the species living together. (a) is a population, (c) is an ecosystem, (d) is the biosphere.
2
Plants compete for all the following EXCEPT:
Answer & explanation
Correct: option C
Plants make their own food by photosynthesis — they do not compete for it. They compete for the inputs: light, water, CO₂, mineral ions and space.
3
Which of the following is the best description of interdependence?
Answer & explanation
Correct: option B
Interdependence is the way species depend on each other for food, shelter, pollination, seed dispersal etc.
4
A stable community is one in which:
Answer & explanation
Correct: option C
Stable means in balance with population sizes roughly constant. Small natural changes still happen.
5
Which of the following is the correct order from smallest to largest?
Answer & explanation
Correct: option B
Smallest first: a single organism → a population of one species → a community of many species → an ecosystem (community + abiotic) → the biosphere (all ecosystems).