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Revision Notes

Pollution

Telangana Open School (TOSS) · Class 12 · Biology

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

54 questions30 flashcards5 concepts

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Key Topics to Revise

1

Definition and Types of Pollution

  • Pollution is the addition of unwanted or harmful substances into the environment that adversely affect living beings and ecosystems.
  • Pollutants are the agents that cause pollution. They can be chemical, physical, or biological in nature.
  • Main types of pollution: Air, Water, Soil, Noise, and Radiation pollution.
2

Air Pollution

  • Air pollution is the contamination of air by harmful gases, particulate matter, and biological molecules.
  • Major sources: vehicles, industries, power plants, burning of fossil fuels, firewood, and crop residues.
  • Primary pollutants: CO, CO₂, SO₂, NO₂, PM (Particulate Matter), VOCs.
3

Water Pollution

  • Water pollution occurs when harmful substances contaminate water bodies, making water unfit for use.
  • Sources: domestic sewage, industrial effluents, agricultural runoff (fertilizers, pesticides), plastic waste.
  • Key pollutants: organic waste, heavy metals (lead, mercury), pathogens, oils, plastics, heated effluents.
4

Soil Pollution

  • Soil pollution is the degradation of soil quality due to harmful chemicals or waste.
  • Sources: agricultural chemicals (fertilizers, pesticides), industrial waste, plastic waste, improper waste disposal.
  • Effects: reduced soil fertility, decreased crop yield, contamination of food chain, harm to soil organisms.

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Full Notes

Key Concepts

Pollution refers to the introductionAir pollution occurs when harmful gasesWater pollution happens when toxic substancesSoil pollution arises from the accumulationNoise pollution refers to excessive

Frequently Asked Questions

What are the important topics in Pollution for Telangana Open School (TOSS) Class 12 Biology?
Pollution 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 Pollution — Telangana Open School (TOSS) Class 12 Biology?
Understand the core concepts first, then work through the 54 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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