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Revision Notes

Natural Environment

NIOS · Class 10 · Science & Tech

Quick revision notes for Natural Environment — NIOS Class 10 Science & Tech. Key concepts, formulas, and definitions for last-minute revision.

45 questions20 flashcards5 concepts

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Key Topics to Revise

1

Ecosystem and Its Components

  • An ecosystem is a biological environment consisting of all organisms in an area and their physical environment
  • A.G. Tansley coined the term 'ecosystem' in 1935 from Greek words 'oikos' (home) and 'systema' (system)
  • Natural ecosystems include terrestrial (grasslands, deserts) and aquatic (rivers, ponds, oceans) types
2

Biotic Community and Nutrition Types

  • Biotic community: populations of various organisms living together in the same habitat
  • Autotrophs (producers): manufacture their own food through photosynthesis or chemosynthesis
  • Heterotrophs (consumers): depend on other organisms for food - herbivores, carnivores, omnivores
3

Food Chains and Food Webs

  • Food chain: succession of organisms where each feeds on the previous level
  • Trophic levels: feeding levels in a food chain (I-producers, II-herbivores, III-carnivores)
  • Grazing food chain: starts with living plants (grass→rabbit→fox)
4

Energy Flow in Ecosystems

  • Energy flow is unidirectional - does not return to previous levels
  • Only 10% of energy transfers to the next trophic level (10% rule)
  • 90% of energy is lost as heat or used for life processes

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Full Notes

Key Concepts

A biological environment consisting of allBiotic components are living organisms (plantsFood chain shows linear transferCyclic movement of chemical elements likeSpecial features that allow organisms

Frequently Asked Questions

What are the important topics in Natural Environment for NIOS Class 10 Science & Tech?
Natural Environment covers several key topics that are frequently asked in NIOS Class 10 board exams. Focus on the core concepts listed on this page and practise related questions to build confidence.
How to score full marks in Natural Environment — NIOS Class 10 Science & Tech?
Start by understanding all key concepts. Practise previous year questions from this chapter. Revise formulas and definitions regularly. Use flashcards for quick revision before the exam.

Sources & Official References

Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.

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