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Revision Notes

Soil Pollution

Kerala Board · Class 9 · Biology

Quick revision notes for Soil Pollution — Kerala Board Class 9 Biology. Key concepts, formulas, and definitions for last-minute revision.

45 questions20 flashcards5 concepts

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Key Topics to Revise

1

Soil Composition and Properties

  • Soil is composed of 45% minerals, 25% air, 25% water, and 5% organic matter
  • Organic matter consists of 80% humus, 10% roots, and 10% organisms
  • Soil formation takes 100 to 10,000 years to create one inch of topsoil
2

Types of Waste and Soil Pollution

  • Biodegradable wastes: vegetable peels, paper, wood - decompose naturally
  • Non-biodegradable wastes: plastics, glass, metals - do not decompose easily
  • Soil pollution is addition of substances that adversely affect soil quality or fertility
3

Causes of Soil Pollution

  • Indiscriminate use of fertilizers: NPK fertilizers contain toxic metals like As, Pb, Cd
  • Excessive pesticide use: DDT, BHC, organophosphates persist in soil
  • Industrial waste dumping: heavy metals, chemicals contaminate soil
4

Effects of Soil Pollution

  • Reduced soil fertility and crop yield
  • Contamination of food chain and water sources
  • Health problems: cancer, birth defects, nervous system disorders

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Full Notes

Key Concepts

Soil is composed of 45% mineralsSoil has three types of propertiesBiodegradable wastes (vegetable peelsExcessive use of chemical fertilizers (NPK)The process where toxic chemicals like

Frequently Asked Questions

What are the important topics in Soil Pollution for Kerala Board Class 9 Biology?
Soil Pollution covers several key topics that are frequently asked in Kerala Board Class 9 board exams. Focus on the core concepts listed on this page and practise related questions to build confidence.
How to score full marks in Soil Pollution — Kerala Board Class 9 Biology?
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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