Are these Ecosystem notes free?

Yes. The full 4-page Ecosystem sheet is free inside CapCompass, which runs in your browser with no account needed.

What does the Ecosystem revision sheet cover?

Ecosystem structure: what's living, what isn't, The four components, Grazing food chain vs Detritus food chain, Grazing food chain, Detritus food chain, Trophic levels, in sequence, Producers, Primary consumers, Secondary consumers, Tertiary consumers, The 10 percent law, Energy reaching the third trophic level.

Is this for Class 12 CBSE Biology?

It is written from the NCERT syllabus, so it serves CBSE and any board that follows NCERT for Biology.

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Ecosystem — Class 12 CBSE Biology revision notes

A 4-page visual revision sheet for Ecosystem, written for Class 12 CBSE Biology. Formulas, diagrams and the traps that cost marks, laid out to be read the night before rather than the term before. Free, and it opens inside CapCompass.

Ecosystem revision notes, page 1 of 4 — A preview of page 1 — all 4 pages open full size in the app.

Ecosystem in one look

energy flows one way through it, matter cycles back

Ecosystem structure: what's living, what isn't

abiotic components are the non-living part: climatic factors like temperature and rainfall
also edaphic factors like soil, plus the inorganic and organic substances present
producers are the autotrophs, mostly photosynthetic, that fix energy into the system first
on land they are plants; in water, phytoplankton and algae
consumers are heterotrophs split by diet: primary (herbivores), secondary (eat herbivores), tertiary (eat carnivores)
decomposers, mainly bacteria and fungi, break down dead organic matter using enzymes secreted outside their cells

Grazing food chain vs Detritus food chain

Grazing food chain

starts from living producers: plant eaten by herbivore, herbivore eaten by carnivore
the more familiar of the two, and the one most food-web diagrams draw

Detritus food chain

starts from dead organic matter: detritus is consumed and broken down by decomposers and detritivores
in many ecosystems, especially forests, this pathway processes more energy than the grazing chain does

Trophic levels, in sequence

Producers: fix energy from sunlight via photosynthesis
Primary consumers: herbivores, feeding directly on producers
Secondary consumers: primary carnivores, feeding on the herbivores
Tertiary consumers: secondary carnivores, feeding on other carnivores

Page 1 of 4. The full sheet, all 4 pages, opens free in the app.

What this Ecosystem sheet covers

Ecosystem structure: what's living, what isn't
The four components
Grazing food chain vs Detritus food chain
Grazing food chain
Detritus food chain
Trophic levels, in sequence
Producers
Primary consumers
Secondary consumers
Tertiary consumers
The 10 percent law
Energy reaching the third trophic level
Productivity: GPP, NPP, and what's left over
Ecological succession: how a community changes over time
Kinds of succession, sorted two ways
Primary
Secondary
Hydrarch
Xerarch
Decomposition: how detritus becomes nutrients again
Detritus, broken down
What speeds up or slows down decomposition
Nutrient cycles: two kinds of reservoir
Ecological pyramids: usual shape and the exception
Pyramid shapes, and what gets counted
Traps that cost marks
Tricks that save time

Open the full Ecosystem sheet →Free, works offline, no account needed. All 4 pages, plus a study plan built around your own exam dates.

How CapCompass uses this sheet

These notes are not a standalone PDF. CapCompass plans Biology chapter by chapter against your real exam dates and free hours, and when the plan reaches Ecosystem the sheet opens inside the study block itself — at the page covering the sub-topic that block is on, with the timer still running. Revision arrives at the moment the plan says revise, instead of having to be gone looking for.