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Biodiversity

ICSE · Class 9 · Environmental Science

Quick revision notes for Biodiversity — ICSE Class 9 Environmental Science. Key concepts, formulas, and definitions for last-minute revision.

57 questions40 flashcards5 concepts

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Key Topics to Revise

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1. Meaning and Types of Biodiversity

  • Biodiversity includes genetic differences within species, diversity of species, and variety of ecosystems.
  • The term biodiversity is derived from biological diversity.
  • There are three main types of biodiversity: genetic diversity, species diversity, and ecosystem diversity.
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2. Genetic Diversity and Conservation

  • Genetic diversity arises due to mutations, gene flow, genetic drift, and sexual reproduction.
  • Traditional rice varieties show better resistance to floods or pests than genetically uniform, high-yield varieties.
  • High genetic diversity helps populations adapt and survive environmental changes.
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3. Species Diversity and Its Measurement

  • Species diversity means the variety, number, and relative abundance of species in an ecosystem.
  • Species richness is the total number of different species in an area.
  • Species evenness is the distribution of individuals among different species.
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4. Indicator Species, Keystone Species, and Ecosystem Health

  • Indicator species act as early warning signs of environmental changes.
  • Frogs indicate water quality and lichens indicate air quality.
  • Removal of indicator species may show environmental problems but may not immediately disturb the ecosystem.

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Full Notes

Key Concepts

Biodiversity refers to the total varietyGenetic diversity is the variationSpecies diversity is the varietyEcosystem diversity is the varietyIndicator species reflect ecosystem health

Frequently Asked Questions

What are the important topics in Biodiversity for ICSE Class 9 Environmental Science?
Biodiversity covers several key topics that are frequently asked in ICSE 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 Biodiversity — ICSE Class 9 Environmental Science?
Understand the core concepts first, then work through the 57 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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