Environment and Ecology | Ecosystem | UPSC Prelims 2026 | Episode 1 | Drishti IAS

GS Studio Foundation Course में एडमिशन के लिए दिए गए लिंक पर क्लिक करें-
हिंदी मीडियम: https://drishti.xyz/GS-Studio-Foundation-Online-Course-Hindi
English Medium: https://drishti.xyz/GS-Studio-Foundation-Online-Course-English
Hinglish Medium: https://drishti.xyz/gs-studio-foundation-online-course-Hinglish

GS Studio Foundation Course की अधिक जानकारी या काउंसलिंग के लिए लिंक पर क्लिक करें –
https://drishti.xyz/GS-Studio-Foundation-Course
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In Episode 1 of the Environment and Ecology series for UPSC Prelims 2026, Mr. Vaibhav Shivhare, Faculty at Drishti IAS, explains one of the most important and high-yield topics — Trophic Levels and Energy Flow in an Ecosystem. Based on Previous Year Question (PYQ) analysis, this topic has been repeatedly asked in UPSC Prelims (notably in 2011, 2013, and 2017), making it extremely important for exam preparation. The lecture clearly covers the structure and function of an ecosystem, biotic and abiotic interactions, the concept of food chain, trophic levels, and the unidirectional flow of energy. Special emphasis is given to the 10% Rule of Energy Transfer, biomass reduction across trophic levels, limitations of food chain length in terrestrial ecosystems, and the concept of biomagnification. The session also introduces ecological pyramids and includes practice questions to strengthen conceptual clarity and improve accuracy for prelims. This episode builds a strong conceptual foundation in Ecology for UPSC aspirants.
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महत्त्वपूर्ण प्लेलिस्ट:

1. Drishtikon By Dr. Vikas Divyakirti:
https://drishti.xyz/Drishtikon-by-Dr-Vikas-Divyakirti

2. Videos by Dr. Vikas Divyakriti:
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3. Concept Talk- By Dr. Vikas Divyakirti:
https://drishti.xyz/Concepttalk-DrVikasDivyakirti-Playlist-YT

4. NCERT Foundation Series:
https://drishti.xyz/NCERT-Foundation-Series-Hindi

5. How to Prepare Optional:
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6. Optional Subject Demo Classes:
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7. Daily Current News:
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8. Simplified Videos:
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9. Drishti IAS Special:
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10. Duniya Is Hafte:
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11. Topper’s Success Stories:
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12. UPSC Prelims PYQ Analysis:
https://drishti.xyz/UPSC-Prelims-PYQ-Analysis-Hindi

13. UPSC Mock Interview 2024:
https://drishti.xyz/UPSC-2024-Mock-Interview-Hindi-Medium

14. IAS Toppers Talk 2024:
https://drishti.xyz/Toppers-Talk-2024

15. IAS Toppers’ Seminar:
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16. IAS Toppers’ Strategy:
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हमारे प्रमुख कोर्सेज़:

1. GS Foundation Courses:
https://drishti.xyz/GS-foundation-Online-Courses

2. GS Studio Foundation Course (Hindi):
https://drishti.xyz/GS-Studio-Foundation-Online-Course-Hindi

3. GS Studio Foundation Course (Hinglish):
https://drishti.xyz/gs-studio-foundation-online-course-Hinglish

4. GS Studio Foundation Course (English):
https://drishti.xyz/GS-Studio-Foundation-Online-Course-English

5. NCERT Online Courses:
https://drishti.xyz/NCERT-Online-Courses

6. UPSC Optional Subjects Online Courses:
https://drishti.xyz/UPSC-Optional-Subjects-Online-Courses

7. IAS Prelims 2026 Online Courses:
https://drishti.xyz/IAS-Prelims-2026-Online-Courses

8. IAS Mains 2026 Online Courses:
https://drishti.xyz/IAS-Mains-2026-Online-Courses

9. Current Affairs (Prelims + Mains) IAS 2026 Online Courses:
https://drishti.xyz/UPSC-Current-Affairs-P-M-Online-Courses

10. UPSC Prelims 2026 Test Series:
https://drishti.xyz/IAS-Prelims-2026-Test-Series

11. UPSC Mains 2026 Test Series:
https://drishti.xyz/IAS-Mains-2026-Test-Series

12. EPFO Online Course:
https://drishti.xyz/UPSC-EPFO-Online-Courses

13. CAPF Online Courses:
https://drishti.xyz/CAPF-Online-Courses
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Видео Environment and Ecology | Ecosystem | UPSC Prelims 2026 | Episode 1 | Drishti IAS канала Drishti IAS