Kerala PSC Environmental Science Model Questions & Answers 2026 – Latest MCQs

Kerala PSC Environmental Science Model Questions & Answers  – 25 MCQs

Section 1: Basic Ecology and Ecosystems

1. Which trophic level do decomposers occupy in an ecosystem?
Decomposers act as the final link in the food chain, breaking down organic matter and returning nutrients to the soil. They do not occupy a fixed numbered trophic level but function across all levels.

2. What is the term for the number of different species in a given area?
Species richness.

3. Which biogeochemical cycle involves nitrogen fixation by bacteria such as Rhizobium?
The Nitrogen Cycle.

4. What is an ecotone?
A transition zone between two different ecosystems, such as the boundary between a forest and a grassland, which often shows higher biodiversity than either adjoining ecosystem.

5. Which pyramid in an ecosystem is always upright?
The pyramid of energy.

Section 2: Kerala-Specific Environmental Topics

6. Which mountain range, known as one of the world’s biodiversity hotspots, runs along Kerala’s eastern border?
The Western Ghats.

7. Periyar Tiger Reserve is located in which district of Kerala?
Idukki district.

8. Which Kerala wetland is designated as a Ramsar site and is known for its backwaters?
Vembanad Lake.

9. What is the local name for the traditional rain-fed paddy wetland ecosystem found in Kuttanad?
Kaipad and Pokkali cultivation are associated systems, with Kuttanad itself lying below sea level and farmed using unique reclamation methods.

10. Silent Valley National Park, famous for opposing a hydroelectric project in the 1970s-80s, is located in which district?
Palakkad district.

11. Which committee’s report led to significant discussion on the ecological fragility of the Western Ghats?
The Madhav Gadgil Committee (Western Ghats Ecology Expert Panel) report, followed later by the Kasturirangan Committee report.

Section 3: Pollution and Environmental Degradation

12. Which gas is primarily responsible for the depletion of the ozone layer?
Chlorofluorocarbons (CFCs).

13. BOD is a key indicator used to measure which type of pollution?
Water pollution — Biochemical Oxygen Demand measures the amount of dissolved oxygen consumed by microorganisms in decomposing organic matter.

14. Which act in India specifically deals with the prevention and control of water pollution?
The Water (Prevention and Control of Pollution) Act, 1974.

15. What does the Air Quality Index (AQI) primarily measure?
The concentration of pollutants such as PM2.5, PM10, NO2, SO2, CO, and ozone in ambient air, converted into a standardized scale.

16. Endosulfan, a pesticide linked to serious health and environmental damage in Kerala, was most notably associated with which district?
Kasaragod district.

Section 4: Climate Change and Global Environmental Concerns

17. Which international agreement, adopted in 2015, aims to limit global warming to well below 2°C?
The Paris Agreement.

18. What is the primary greenhouse gas contributing to global warming?
Carbon dioxide (CO₂).

19. Which conference is regarded as the origin of the modern environmental movement, held in Stockholm in 1972?
The United Nations Conference on the Human Environment (Stockholm Conference).

20. What term describes the phenomenon of rising sea levels submerging low-lying coastal areas, a concern for Kerala’s coastline?
Coastal erosion/inundation due to sea-level rise.

Section 5: Environmental Laws and Institutions

21. The Wildlife Protection Act was enacted in which year?
1972.

22. Which body is responsible for monitoring and enforcing environmental standards at the national level in India?
The Central Pollution Control Board (CPCB).

23. The Kerala State Pollution Control Board was established in which year?
1974.

24. Project Tiger, a wildlife conservation initiative, was launched in which year?
1973.

25. Which schedule of the Wildlife Protection Act provides the highest degree of protection to species?
Schedule I.

Preparation Strategy for Environmental Science in Kerala PSC Exams

1. Prioritize Kerala-specific content first — questions on Silent Valley, Periyar, Western Ghats committees, and local pollution case studies (like Endosulfan) appear disproportionately often compared to generic environmental theory.
2. Set a timeline chart of major environmental acts, conferences, and committees — PSC frequently tests years and chronology.
3. Revise using short, repeated cycles rather than one long reading session — environmental science facts are easy to confuse (BOD vs COD, CPCB vs SPCB) without spaced repetition.
4. Practice previous year questions extensively, since Kerala PSC often repeats question patterns across different posts and years.
5. Link current affairs — environmental summits, Kerala govt initiatives, and biodiversity news often connect directly to static portions of the syllabus.

Preparing for your Kerala PSC exam? Entri App offers structured mock tests, detailed model question sets, and topic-wise study material designed specifically for Kerala PSC aspirants across LDC, LGS, Degree Level, and Secretariat Assistant exams. Practice with expert-curated content and track your progress as you prepare to crack your exam on the first attempt.