Saturday Environment Quiz: 15 MCQs on Ecology, Pollution and Climate
Quick Answer: This Saturday Environment Quiz gives you 15 exam-pattern MCQs covering ecology, biodiversity, environmental conventions and pollution control laws for UPSC Prelims, SSC CGL/CHSL and Banking GS sections. The total timer target is 12 minutes — roughly 45 seconds per question plus a 2-minute review window. Score 13+ correct for exam-level readiness, and use the answer key and revision table below to plug gaps before your next attempt.
- Quiz Snapshot: What This 15-MCQ Environment Quiz Covers
- How to Use the Timer Targets for Maximum Score
- Section A: Ecology and Biodiversity MCQs (Q1–Q5)
- Section B: Environmental Conventions and Protocols MCQs (Q6–Q10)
- Section C: Pollution and Pollution Control Boards MCQs (Q11–Q15)
- Answer Key with Quick Explanations
- Scorecard and Timer Target Analysis
- Common Mistakes Aspirants Make in Environment MCQs
- Key Facts to Revise: Biodiversity, Conventions and Boards
- Related Environment Quizzes and Daily Current Affairs Practice
- Frequently Asked Questions
- Q: How many questions from Environment appear in UPSC Prelims and SSC exams?
- Q: What are the timer targets for this 15-question quiz?
- Q: Which Acts and conventions should I memorise for pollution questions?
- Q: Where can I find daily environment and current affairs quizzes?
- Related reading
Quiz Snapshot: What This 15-MCQ Environment Quiz Covers
This quiz is modelled on the environment and ecology sections that appear consistently in UPSC Prelims GS Paper I and the GS/GK sections of SSC CGL, CHSL and Banking exams. Environment questions typically reward precision — one wrong year, one confused convention, and the mark is gone.
Format: 15 MCQs | Timer target: 12 minutes total (about 45 seconds per question + 2-minute review) | Syllabus mapping:
- Section A (Q1–Q5): Ecology and biodiversity — food chains, ecological pyramids, keystone species, biodiversity hotspots, IUCN categories.
- Section B (Q6–Q10): Conventions and protocols — Rio Summit, Kyoto Protocol, Paris Agreement, CBD, Ramsar, CITES, Montreal Protocol.
- Section C (Q11–Q15): Pollution — CPCB/SPCB roles, Water Act 1974, Air Act 1981, pollutant types and standards.
How to Use the Timer Targets for Maximum Score
The 45-second benchmark per question mirrors real exam pressure. UPSC Prelims allots roughly 1 minute 30 seconds per question across the paper, but environment questions are fact-based — they should be answered faster to bank time for reasoning-heavy questions.
Strategy:
- 0–45 seconds: Read the question, eliminate two clearly wrong options, and mark an answer.
- 45–60 seconds: If still undecided, mark for review and move on — do not let one question eat into the next.
- Minutes 10–12: Use the 2-minute review window exclusively for questions you marked, not for re-litigating confident answers.
Attempting this quiz honestly — timed, without notes or search — is the only way the scorecard benchmarks below mean anything.
Section A: Ecology and Biodiversity MCQs (Q1–Q5)
Q1. In a food chain, the maximum energy transfer efficiency between trophic levels, as per Lindeman’s 10% law, is approximately:
(a) 1% (b) 10% (c) 25% (d) 50%
Q2. Which of the following ecological pyramids is always upright, in every ecosystem?
(a) Pyramid of number (b) Pyramid of biomass (c) Pyramid of energy (d) Pyramid of biomass in a lake ecosystem
Q3. Which of the following is a classic example of a keystone species?
(a) Domestic goat (b) Sea otter (c) House sparrow (d) Catfish
Q4. How many biodiversity hotspots are there in India?
(a) 2 (b) 3 (c) 4 (d) 5
Q5. In IUCN Red List terminology, a species facing “extremely high risk of extinction in the wild” is classified as:
(a) Endangered (b) Vulnerable (c) Critically Endangered (d) Extinct in the Wild
Section B: Environmental Conventions and Protocols MCQs (Q6–Q10)
Q6. The United Nations Framework Convention on Climate Change (UNFCCC) was adopted at which summit?
(a) Stockholm Conference, 1972 (b) Rio Earth Summit, 1992 (c) Kyoto Conference, 1997 (d) Paris Conference, 2015
Q7. The Kyoto Protocol, which imposed binding emission reduction targets on developed countries, came into force in:
(a) 1997 (b) 2001 (c) 2005 (d) 2012
Q8. Under the Paris Agreement, the central temperature goal is to limit global warming to:
(a) Below 3°C above pre-industrial levels (b) Below 2°C, pursuing efforts towards 1.5°C (c) Exactly 1°C (d) Below 1.5°C with no flexibility
Q9. The Ramsar Convention, to which India is a party, deals with the conservation of:
(a) Migratory birds (b) Wetlands (c) Coral reefs (d) Deserts
Q10. The Montreal Protocol deals with substances that deplete the:
(a) Water table (b) Ozone layer (c) Soil fertility (d) Coral cover
Section C: Pollution and Pollution Control Boards MCQs (Q11–Q15)
Q11. The Central Pollution Control Board (CPCB) was constituted under which Act?
(a) Air Act, 1981 (b) Water Act, 1974 (c) Environment (Protection) Act, 1986 (d) Wildlife Protection Act, 1972
Q12. The Air (Prevention and Control of Pollution) Act was enacted in:
(a) 1974 (b) 1981 (c) 1986 (d) 1991
Q13. Which of the following is a primary pollutant as released directly into the atmosphere?
(a) Ozone at ground level (b) PAN (c) Sulphur dioxide (d) Acid rain
Q14. Which pollutant is measured by the Air Quality Index (AQI) parameter “PM2.5”?
(a) Particulate matter of diameter 2.5 micrometres or less (b) Coarse dust above 10 micrometres (c) Sulphur aerosols of 2.5 ppm (d) Nitrogen particles of 2.5 nanometres
Q15. Under the Water Act, 1974, State Pollution Control Boards are primarily responsible for:
(a) Setting India’s climate targets (b) Prevention and control of water pollution and maintaining/wholesomeness of streams and wells in the state (c) Managing national parks (d) Regulating greenhouse gas trading
Answer Key with Quick Explanations
- Q1 — (b) 10%. Lindeman’s 10% law: only about 10% of energy transfers to the next trophic level (NCERT Biology, Class XII).
- Q2 — (c) Pyramid of energy. Energy always decreases up the trophic ladder, so it is always upright; number and biomass pyramids can be inverted (e.g., tree ecosystems, lake biomass).
- Q3 — (b) Sea otter. Sea otters control sea urchin populations, protecting kelp forests — the textbook keystone species example.
- Q4 — (c) 4. India has four biodiversity hotspots: the Himalaya, Indo-Burma, Western Ghats–Sri Lanka, and Sundaland (Nicobar Islands).
- Q5 — (c) Critically Endangered. IUCN Red List criteria define CR as facing an extremely high risk of extinction in the wild (iucnredlist.org).
- Q6 — (b) Rio Earth Summit, 1992. UNFCCC, CBD and Agenda 21 all emerged from Rio; Stockholm 1972 preceded it.
- Q7 — (c) 2005. Adopted in 1997, the Kyoto Protocol entered into force on 16 February 2005 after Russia’s ratification.
- Q8 — (b) Below 2°C, pursuing efforts towards 1.5°C. Article 2 of the Paris Agreement (UNFCCC, unfccc.int).
- Q9 — (b) Wetlands. Ramsar Convention (1971) on wetlands of international importance; India has 89 Ramsar sites as of 2025 (ramsar.org).
- Q10 — (b) Ozone layer. Montreal Protocol, 1987 — the most universally ratified environmental treaty; Kigali Amendment phases down HFCs.
- Q11 — (b) Water Act, 1974. CPCB was constituted under the Water Act to advise the Centre and coordinate SPCBs (cpcb.nic.in).
- Q12 — (b) 1981. The Air Act followed the Stockholm Conference and India’s first vehicle emission norms discussions.
- Q13 — (c) Sulphur dioxide. SO₂ is emitted directly; ground-level ozone, PAN and acid rain are secondary pollutants formed in the atmosphere.
- Q14 — (a) Particulate matter of diameter 2.5 micrometres or less. PM2.5 penetrates deep into the lungs; CPCB’s National AQI uses PM2.5, PM10, NO₂, SO₂, CO, O₃, NH₃, Pb.
- Q15 — (b) Prevention and control of water pollution in the state. SPCBs function under the Water Act 1974 and Air Act 1981 within their states.
Scorecard and Timer Target Analysis
| Score (out of 15) | Verdict | Next Step |
|---|---|---|
| 13–15 | Excellent — exam-ready on environment | Maintain with monthly revision; move to current-affairs-linked environment news |
| 10–12 | Good — conceptual base is solid | Drill conventions’ dates and IUCN statuses; re-attempt next Saturday |
| 8–9 | Average | Revise NCERT Biology Chapters on ecology and the pollution Acts thoroughly |
| Below 8 | Needs revision | Rebuild fundamentals: food chains, pyramids, Acts, conventions — then re-attempt untimed |
Also check your time: if you finished in 12 minutes with 13+ correct, you have both accuracy and pace. If you were accurate but slow, practise elimination; if fast but inaccurate, slow down on qualifiers like “always”, “only” and “never”.
Common Mistakes Aspirants Make in Environment MCQs
- Confusing conventions: Montreal = ozone, Basel = hazardous waste, Ramsar = wetlands, CITES = wildlife trade. Examiners routinely swap these in options.
- Mixing Acts and years: Water Act 1974, Air Act 1981, Environment (Protection) Act 1986, Wildlife Protection Act 1972, Forest Conservation Act 1980 — memorise as a chain.
- Guessing IUCN statuses: Aspirants assume iconic species are Critically Endangered. Verify against the IUCN Red List (iucnredlist.org) — e.g., the Snow Leopard is Vulnerable, not Endangered.
- Wrong hotspot count: India has four hotspots, not three — candidates forget Sundaland (Nicobars) or miss Indo-Burma’s overlap with the Northeast.
- Ignoring CPCB vs NEPCC roles: CPCB regulates pollution; climate policy sits with the Ministry of Environment, Forest and Climate Change (moef.gov.in).
Key Facts to Revise: Biodiversity, Conventions and Boards
| Fact | Detail |
|---|---|
| India’s biodiversity hotspots | 4 — Himalaya, Indo-Burma, Western Ghats–Sri Lanka, Sundaland |
| Lindeman’s 10% law | ~10% energy transfers between trophic levels |
| Stockholm Conference | 1972 — first UN environment conference |
| Rio Earth Summit | 1992 — UNFCCC, CBD, Agenda 21 |
| Kyoto Protocol | Adopted 1997, in force 2005; binding targets for developed nations |
| Paris Agreement | 2015, in force 2016 — well below 2°C, pursue 1.5°C |
| Montreal Protocol | 1987 — ozone-depleting substances; Kigali Amendment 2016 (HFCs) |
| Ramsar Convention | 1971 — wetlands; India has 89 Ramsar sites |
| CPCB | Constituted under Water Act 1974; advisories, standards, coordination of SPCBs |
| Water Act 1974 | Water pollution control; constituted CPCB and SPCBs |
| Air Act 1981 | Air pollution control; consolidated boards after 1988 amendment |
| Environment (Protection) Act 1986 | Umbrella Act post-Bhopal; empowered Centre to set standards |
Related Environment Quizzes and Daily Current Affairs Practice
Make this quiz a weekly habit — timed Saturday quizzes build the pacing reflex that matters on exam day. Pair static environment revision with current affairs, because UPSC increasingly frames convention and pollution questions around recent news (new Ramsar sites, COP outcomes, AQI spikes). Verify any exam-adjacent environment news against official sources such as pib.gov.in, moef.gov.in, cpcb.nic.in and unfccc.int before relying on it.
Frequently Asked Questions
Q: How many questions from Environment appear in UPSC Prelims and SSC exams?
Typically 10–15 environment and ecology questions appear in UPSC Prelims GS Paper I, and 3–5 questions in the GS sections of SSC CGL/CHSL and similar exams — making it one of the highest return-on-investment areas for revision.
Q: What are the timer targets for this 15-question quiz?
Complete the quiz in 12 minutes: roughly 45 seconds per question for the first 10 minutes, followed by a 2-minute review window to revisit marked questions only.
Q: Which Acts and conventions should I memorise for pollution questions?
Memorise the Water Act 1974, Air Act 1981 and Environment (Protection) Act 1986 for Indian law, plus the Kyoto Protocol, Paris Agreement, Montreal Protocol and Basel Convention for international frameworks — together these cover the bulk of pollution-related MCQs.
Q: Where can I find daily environment and current affairs quizzes?
Explore the daily current affairs quiz and the weekly Saturday quiz archive on Hmmnm.in for regular timed practice that combines static environment concepts with the latest government and exam-relevant news.
Related reading
- Greenhouse Effect vs Global Warming vs Climate Change: Terms Exams Confuse, Untangled
- Ramsar Sites of India Explained: Number, Criteria and State-Wise Facts for UPSC
Quick revision
- Section A (Q1–Q5): Ecology and biodiversity — food chains, ecological pyramids, keystone species, biodiversity hotspots, IUCN categories.
- Section B (Q6–Q10): Conventions and protocols — Rio Summit, Kyoto Protocol, Paris Agreement, CBD, Ramsar, CITES, Montreal Protocol.
- Section C (Q11–Q15): Pollution — CPCB/SPCB roles, Water Act 1974, Air Act 1981, pollutant types and standards.
- 0–45 seconds: Read the question, eliminate two clearly wrong options, and mark an answer.
- 45–60 seconds: If still undecided, mark for review and move on — do not let one question eat into the next.
- Minutes 10–12: Use the 2-minute review window exclusively for questions you marked, not for re-litigating confident answers.
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