Ecosystem — NEET/JEE Questions, Notes & Weightage
Class 12 Ecology and Environment NEET weightage: High 1,072 questions
Covers energy flow (10% law), food chains/webs, ecological pyramids, nutrient cycling (carbon, phosphorus), and ecosystem types. The 10% energy-transfer law and pyramid-of-numbers/biomass questions are this chapter's most reliable NEET contributions.
Practice all 1,072 Ecosystem questions →Topics inside Ecosystem
12-4-energy-flow
355
12-3-decomposition
267
12-2-productivity
202
12-5-ecological-pyramids
142
12-1-ecosystem-structure-and-function
86
Energy Flow
6
decomposition
5
ecological-pyramids
4
ecosystem-structure
3
productivity
2
Pyramids
1
food-webs
1
trophic-levels
1
Frequently asked questions
What is the most-tested numerical concept in Ecosystem?
The 10% law of energy transfer between trophic levels, and calculating energy/biomass available at a given trophic level from it, is the chapter's signature numerical question type.
Are ecological pyramids (number, biomass, energy) tested individually?
Yes — including the exception cases (e.g. an inverted pyramid of numbers in a tree ecosystem) which NEET specifically likes to test as conceptual traps.
Is the carbon cycle tested in more detail than other nutrient cycles?
Yes, generally — the carbon cycle (and to a lesser extent phosphorus) gets more direct attention than other biogeochemical cycles in past NEET papers.