Previous year questions are the best investment of your study time. For natural resources, the same concepts cycle through CBSE, NEET, and JEE papers with small tweaks. We will walk through a representative PYQ below.
Question
A village of 2000 people consumes 40 litres of water per person per day. The well yields 60,000 L/day. Is supply sufficient? By how much is it short or surplus?
(Adapted from recent board and entrance exam patterns on natural resources.)
Solution — Step by Step
This PYQ tests your grip on renewable vs non-renewable, conservation, biogeochemical cycles. Before solving, name the concept — that alone earns method marks in board exams.
Write down every number with its unit. Circle what is asked. Skipping this step is why students misread easy PYQs as “tricky”.
Use the standard formula or definition relevant to natural resources. The examiner is not trying to trap you — they want to see you execute the textbook method cleanly.
Short by 20,000 L/day. Units are mandatory. A correct number without units loses the unit mark.
The answer is Short by 20,000 L/day. CBSE 2023 asked students to differentiate renewable from non-renewable resources with two examples each.
Why This Works
PYQ patterns in natural resources repeat because the NCERT syllabus is fixed and examiners pick from a limited pool of testable concepts. Once you have solved 30-40 PYQs, you will recognise the question before you finish reading it.
CBSE 2023 asked students to differentiate renewable from non-renewable resources with two examples each.
Alternative Method
Some PYQs can be solved by elimination — rule out the obviously wrong MCQ options first, then pick the best remaining choice. This is a lifesaver when you are stuck on a concept but can eliminate two bad options using general biology sense.
Common Mistake
Students read the PYQ solution, nod “yes makes sense”, and move on without re-solving it themselves three days later. Passive reading does not build recall. Re-solve every PYQ from scratch at least twice before the exam.
Keep a PYQ logbook. For each question, note the date solved, whether you got it right, and the concept tested. Review the “got wrong” column every weekend.