Understanding Ecotones and Energy Flow in Ecosystems | UPSC Prelims 2026 | Drishti IAS English

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Prepare for UPSC Prelims 2026 with a comprehensive analysis of the Environment and Ecology section. In this session, Mr. Akshay Gurubhaiye, Expert Faculty at Drishti IAS, covers the most important topics such as Niche and Habitat, Ecotone and Edge Effect, Trophic Levels and Energy Flow, Ecological Pyramids, Biogeochemical Cycles, Ecological Succession, Terrestrial and Aquatic Biomes, Bioaccumulation and Biomagnification, and Greenwashing—critical for solving environment-related MCQs in the UPSC Prelims Exam.
In this session, you will learn about:
✔ Niche and Habitat – Understand the difference between a species’ niche and its habitat, and how these concepts are crucial for the survival of organisms in different ecosystems.
✔ Ecotone and Edge Effect – Learn about ecotones, the transition areas between different ecosystems, and how the edge effect influences species diversity.
✔ Trophic Levels and Energy Flow – Explore the concept of energy flow in ecosystems and the various trophic levels, including producers, consumers, and decomposers.
✔ Ecological Pyramids – Understand the structure of ecological pyramids, their types (energy, biomass, and number), and their role in depicting the balance of energy in ecosystems.
✔ Biogeochemical Cycles – Learn about the cycles of essential elements like carbon, nitrogen, and water, and how they contribute to maintaining ecological balance.
✔ Ecological Succession – Discover how ecosystems evolve over time through primary and secondary succession and the factors driving these changes.
✔ Greenwashing – Learn about greenwashing, a deceptive practice where companies falsely claim environmental benefits to enhance their public image.
This lecture is part of the 100 Most Important Topics for UPSC Prelims 2026 series and will help aspirants enhance their environmental science concepts for objective questions and conceptual clarity.
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