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Environment and Ecology Notes

One of the most essential subjects in the civil service examination is Environment and Ecology. In both the UPSC Prelims and Mains, questions from this area have been asked often. As a result, it is critical to obtain notes on crucial Environment themes in preparation for the UPSC Civil services Examination. These Notes are also useful for State Services Examinations.

Mains Test Series for UPSC 2026

The UPSC Prelims Syllabus and UPSC Mains Syllabus both include environmental and related themes (GS III). Also, Environment-related subjects occasionally appear in the UPSC Civil services Mains Examination Essay paper.

On this page, we are Providing authentic study notes for the Environment and Ecology Subject which is part of the UPSC Civil services examination Prelims GS Paper 1 and GS III of UPSC CS Mains Examination.

Environment and Ecology Master Page

Environment and Ecology

Ecosystem

(a) Ecosystem

(b) Components of Ecosystem

(c) Classification of an Ecosystem

(d) Funtions of Ecosystem

(e) Food Chain

(f) Ecological Pyramids

(g) Pollutants and Tropic Level

(h) Types of Biotic Interaction

(i) Biogeochemical Cycle

(j) Ecological Succession

Terrestrial Ecosystem

(a) Terrestrial Ecosystem

(b) Forest

(c) Indian Forest Types

(d) Deforestation

(e) Grassland Ecosystem

(f) Desert Ecosystem

(g) Desertification

Aquatic Ecosystem

(a) Types of Aquatic Ecosystems

(b) Aquatic Organisms

(c) Factors Limiting the Productivity of Aquatic Habitats

(d) Lake Ecosystems

(e) Eutrophication

(f) Change in Ecosystem

(g) Wetlands Ecosystem

(h) Estuary Ecosystem

(i) Mangroves Ecosystem

(j) Coral Reefs

(k) Ganga Action Plan

Environmental Pollution

(a) Environmental Pollution

(b) Air Pollution

(c) Water Pollution

(d) Soil Pollution

(e) Noise Pollution

(f) Radioactive Pollution

(g) Solid Waste

(h) Thermal Pollution

(i) Plastic Pollution

(j) Bioremediation

(k) Environment Pollution and Health

(l) Acid Rain

Renewable Energy

(a) Solar Energy

(b) Wind Energy

(c) Hydro Power

(d) Ocean Thermal Energy

(e) Biomass

(f) Geothermal Energy

(g) Fuel Cells

Environmental Issues

Environment Impact Assessment

Biodiversity

(a) Levels of Biodiversity

(b) Measures of Biodiversity

(c) Services Provided by Biodiversity

(d) Biodiversity Conservation

(e) The Red Data Book

(f) Convention on Biological Diversity

Indian Biodiversity

WPA 1972

Animal Diversity of India

(a) Critically Endangered Animals in India

(b) Critically Endangered Birds

(c) Corals

(d) Wildlife Diseases

(e) Other Issues

Plant Diversity of India

(a) Insectivorous Plants in India

(b) Invasive Alien Species

(c) Medicinal Plants in India

(d) Tree Characters

Marine Organisms

Protected Area Network

(a) National Initiatives

(b) Global Initiatives

Wildlife Conservation Efforts

(a) Tiger(En)

(b) Elephant(En)

(c) Vulture

(d) Rhino (Vu)

(e) Snow Leopard (Vu)

(f) Other Initiatives

Climate Change

(a) Global Warming and Climate Change

(b) Green House Effect

(c) Ocean Acidification

(d) Arctic Amplification

(e) Methane and Climate Change

(f) Ozone Depletion

(g) Impact of Climate Change

Mitigation Strategies

Climate Change and Disaster Risk Reduction

India and Climate Change

Climate Change Organisations

(a) UNFCCC

Other Organizations and Initiatives

Important Terms Associated with Environment and Climate Change

Act and Policies Associated with Environment

Institutions and Measures

International Conventions

Environmental Issues and Health Effects

Miscellaneous Topics in Environment

FAQs

Ques: How important is the environment and ecology section for the UPSC prelims and Mains Exam?

Ans :

From the standpoint of both the IAS Prelims and Mains, the environment and ecology are crucial subjects. About 25 to 30 percent of the general studies paper 1's questions are from this subject. Every year, between 15 and 20 questions are asked in the IAS prelims, which is a large number.

Ques: What are the books and sources for Environment and ecology?

Ans :

Books and resources for environment and ecology

  • The NCERT Textbooks cover geography in classes VI to XI,
  • science in classes VII and X, and biology in classes XII (last 4 chapters)
  • Hindu Newspaper and Yojana Magazine, Shankar IAS Book on Environment You should also refer to the Science Reporter, Down To Earth, and pratiyogita darpan magazine in addition to the aforementioned reference books.
  • Online material of Preppias
  • The Environment Ministry's official website

Ques: What should be considered when preparing the environment?

Ans :

A blend of static and dynamic content is a straightforward strategy for issues relating to the environment. Instead of trying to understand everything there is to know, we should simply relate to one another and learn.

While reading newspapers, one should be able to connect it to the static content.

*The article might have information for the previous academic years, please refer the official website of the exam.
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