Ecosystem

Biology · Chapter 17 · Unit 5: Ecology and Environment

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Your path through this chapter

1
Visual lesson Beta
1. Part 1: Structure, productivity and decomposition16 slides
2. Part 2: Energy flow and ecological pyramids14 slides
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Notes Beta
5 sections with key terms, formulas and exam tips.
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Flashcards Beta
30 cards for quick recall of key terms and facts.
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Practice
62 board-style questions with instant checks: Multiple choice 26, Short answer 15, Numerical 7, Assertion and reason 4.
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5
Chapter test Free
Short and long chapter tests in board pattern, with results and analysis.
- Chapter test (long) — Ecosystem · 40 marks · 100 min
- Chapter test (short) — Ecosystem · 20 marks · 50 min
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Definition and types of ecosystems; biotic and abiotic components; structure and function of a pond ecosystem
Productivity: GPP, NPP and secondary productivity; PAR; standing crop and standing state
Decomposition: fragmentation, leaching, catabolism, humification and mineralisation; factors affecting rate
Energy flow: grazing and detritus food chains, food webs, trophic levels, 10% law
Ecological pyramids of number, biomass and energy