Ecosystem
ICSE · Class 12 · Biology
Step-by-step guide to study Ecosystem in ICSE Class 12 Biology. Topics to cover, practice strategy, and time allocation.
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Learn the Theory
Read the textbook chapter carefully. Note down definitions, formulas, and key concepts.
Practice Problems
Solve textbook exercises and additional practice questions. There are 60 questions available for this chapter.
Revise & Test
Revise key formulas and concepts without looking at notes. Take a practice quiz to test your understanding. Mark weak areas for re-revision.
Spaced Revision
Revisit Ecosystem after a week. Use flashcards for quick recall. Solve previous year questions from this chapter.
Common Mistakes to Avoid
The pyramid of biomass is always upright, just like the pyramid of energy.
The pyramid of ENERGY is always upright — but the pyramid of BIOMASS can be inverted. In aquatic ecosystems (like the sea), phytoplankton are consumed so rapidly that their standing crop (biomass pres
NPP (Net Primary Productivity) and GPP (Gross Primary Productivity) mean the same thing.
GPP = total rate of photosynthesis — total energy fixed by producers. NPP = GPP minus Respiration (R). Plants use some of the energy they fix for their own respiration (metabolic processes). NPP is th
Decomposition only happens in forests — not in ponds or other ecosystems.
Decomposition occurs in ALL ecosystems — wherever dead organic matter (detritus) exists. In ponds, dead phytoplankton, dead fish, and fallen leaves all decompose in the sediment by anaerobic bacteria.
Memory Tips
Ecosystem Founders
TANSLEY NAMED IT, ODUM DEFINED IT: G. Tansley (1935) named the ecosystem; EP Odum (1962) defined it as the basic functional unit. Forbes & Mobius (1877) first described the concept without the name.
GPP vs NPP
GROSS PAY vs NET PAY: Gross = total earnings. Net = what you take home after tax (respiration). GPP = total photosynthesis. NPP = GPP minus the "respiration tax".
Decomposition — 5 Steps: FLCHM
FIVE LAZY CATS HUMP MINERALS: Fragmentation → Leaching → Catabolism → Humification → Mineralisation.
Lindeman's 10% Law
EVERY TROPHIC LEVEL TAKES 10% AND WASTES 90%: Like a leaky bucket — only 10% passes up. Lindeman measured this in Cedar Bog Lake in 1942.
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