1. Title Paristhitiki evam Paryavaran (Ecology & Environment) — Samanya Adhyayan Visheshank, Adhyayan Samagri evam Hal Prashn Patra, 20th Revised Edition 2026-27 2. Subtitle By Shiv Kumar Ojha | Pariksha Vani (Kautilya Prakashan) | Hindi Medium | For UPSC & State PCS Civil Services | NCERT Based | Part & Section-wise Division | With Solved Papers | 20th Revised Edition 2026-27 3. Product Description Paristhitiki evam Paryavaran — Ecology & Environment (पारिस्थितिकी एवं पर्यावरण), authored by Shiv Kumar Ojha and published under the Pariksha Vani series, is a Hindi medium General Studies special issue (सामान्य अध्ययन विशेषांक) on Ecology and Environment prepared for the Union and State Civil Services examinations (संघ तथा राज्य सिविल सेवा हेतु). Written entirely in Hindi, this 20th revised edition for 2026-27 is NCERT based (NCERT Based), divided part and section-wise (भाग एवं प्रभागवार विभाजित), and combines complete study material (अध्ययन सामग्री) with solved question papers (हल प्रश्न पत्र). Key Features: Written entirely in Hindi (हिंदी माध्यम) for easy understanding Complete Ecology and Environment coverage for the General Studies paper Content prepared on an NCERT basis for authentic, exam-ready study Ecosystems, biodiversity, food chains and ecological succession Environmental pollution, climate change and global warming Conservation — national parks, wildlife sanctuaries, biosphere reserves and protected area networks Environmental laws, institutions, international conventions and protocols Sustainable development, renewable energy and current environmental issues Part and section-wise division for systematic study and easy revision Study material combined with solved question papers of past examinations 20th revised edition, updated for the 2026-27 examination cycle Prepared for UPSC and state PCS civil services aspirants यह पुस्तक "पारिस्थितिकी एवं पर्यावरण (Ecology & Environment) – सामान्य अध्ययन विशेषांक" शिव कुमार ओझा द्वारा लिखित है और पूर्णतः हिंदी भाषा में है। यह NCERT आधारित एवं भाग व प्रभागवार विभाजित है तथा इसमें पारिस्थितिक तंत्र, जैव विविधता, प्रदूषण, जलवायु परिवर्तन, संरक्षण एवं पर्यावरणीय विधियों की संपूर्ण अध्ययन सामग्री हल प्रश्न पत्रों सहित दी गई है। संघ तथा राज्य सिविल सेवा परीक्षाओं की तैयारी हेतु यह 20वाँ संशोधित संस्करण (2026-27) अत्यंत उपयोगी है।