IB Biology HL 4.2.12 Ecological succession Question Bank
Practise IB Biology HL 4.2.12 by applying ecological succession concepts to exam-style questions.
- Syllabus
- First assessment 2025
- Course
- Biology HL
- Level
- HL
Exam points
- identify the relevant biological structure, process or evidence
- apply the correct biological mechanism to the question
- evaluate the result using data, adaptation or ecological reasoning
D4.2.12 (HL)—Ecological succession question 1
[Maximum number: 6]
Outline the energy flow between trophic levels in a food chain.
(original) source of energy in a food chain is from (sun)light;
captured by plants/autotrophs/producers/first trophic level; by means of photosynthesis/converted to chemical energy/organic molecules; plants use part of energy for own energy requirements/lost through cell respiration; consumers use energy for own requirements from organisms in previous trophic level; energy travels between trophic levels/producer to 1st consumer/1st consumer to 2nd consumer/2nd consumer to 3rd consumer; not all material is assimilated/consumed/not digested/lost in faeces / OWTTE; only a small amount of energy/(approximately) 10-20 % is passed between trophic levels / most/80-90\%/a large amount of the energy of a trophic level is lost (and not transferred);
loss of energy from organisms in form of heat; energy is not recycled in an ecosystem (but nutrients are);
Marking guidance:
Award any of the above marking points in a correctly annotated diagram.
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