Environment & Ecology produced 219 of the 1,300 questions UPSC asked in GS Paper I between 2014 and 2026 — 16.8% of the paper, about 16.8 questions a year, and the 3rd largest of 7 subjects. Its thinnest year gave 9 questions and its heaviest 23, which is the range your preparation has to survive.
Recent direction: the last four papers averaged 15.3 against 18.3 in the first four — falling.
One line of syllabus, 7 distinguishable topics. This is the part the syllabus text cannot tell you.
Difficulty is our own tagging, not UPSC's — the Commission publishes no difficulty label.
Note the qualifier UPSC put in its own line: "that do not require subject specialisation". The questions stay at the level of a well-read generalist, which is why a specialist textbook is usually the wrong tool here.
Counted from 1,300 UPSC Prelims GS questions, 2014–2026, each tagged to a topic by UPSC Answer Check. Question papers: Union Public Service Commission.
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