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Revision Notes

Principles of Ecology

Telangana Open School (TOSS) · Class 12 · Biology

Quick revision notes for Principles of Ecology — Telangana Open School (TOSS) Class 12 Biology. Key concepts, formulas, and definitions for last-minute revision.

44 questions35 flashcards5 concepts

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Key Topics to Revise

1

Environment and Levels of Organization

  • The environment includes all physical, chemical, and biological factors surrounding an organism.
  • It is divided into abiotic (non-living) and biotic (living) components.
  • Levels of organization: Genes → Cells → Organs → Organism → Population → Community → Ecosystem.
2

Ecosystem Structure and Function

  • An ecosystem includes biotic components (producers, consumers, decomposers) and abiotic components (light, temperature, water, minerals).
  • Producers (autotrophs) make their own food using sunlight; plants are examples.
  • Consumers (heterotrophs) depend on others for food – herbivores, carnivores, omnivores.
3

Food Chain and Food Web

  • A food chain shows the linear transfer of energy from one organism to another through feeding relationships.
  • Trophic levels: 1st – Producers, 2nd – Primary consumers (herbivores), 3rd – Secondary consumers (carnivores), 4th – Tertiary consumers.
  • Food webs show interconnected food chains, reflecting real-world complexity.
4

Energy Flow and Ecological Pyramids

  • Energy enters ecosystems via sunlight and is captured by producers through photosynthesis.
  • Only about 10% of energy is transferred from one trophic level to the next – known as the 10% law.
  • Energy flow is unidirectional and non-cyclic – once used, it is lost as heat.

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Full Notes

Key Concepts

The environment consists of living (biotic)An ecosystem is a functional unitA food chain shows the transferEnergy enters an ecosystem through sunlightNutrients like carbon

Frequently Asked Questions

What are the important topics in Principles of Ecology for Telangana Open School (TOSS) Class 12 Biology?
Principles of Ecology covers several key topics that are frequently asked in Telangana Open School (TOSS) Class 12 board exams. Focus on the core concepts listed on this page and practise related questions to build confidence.
How to score full marks in Principles of Ecology — Telangana Open School (TOSS) Class 12 Biology?
Understand the core concepts first, then work through the 44 practice questions available for this chapter. Revise formulas and definitions regularly, and use flashcards for quick recall 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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