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Syllabus

Biodiversity — Syllabus

ICSE · Class 9 · Environmental Science

What Biodiversity covers in ICSE Class 9 Environmental Science: 4 topics, for the 2026-27 session. Part of the ICSE Class 9 Environmental Science syllabus.

57 questions40 flashcards5 concepts

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4 Topics · ICSE Class 9 Environmental Science · 2026-27

Topics in Biodiversity

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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.

Key Concepts

Central concept: Biodiversity

Meaning of BiodiversityTypes of BiodiversityGenetic DiversitySpecies DiversityEcosystem DiversityThreats to BiodiversityConservation of BiodiversityIndicator Species and Keystone Species

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Frequently Asked Questions

What are the important topics in Biodiversity for ICSE Class 9 Environmental Science?
Key topics in Biodiversity include Meaning and Types of Biodiversity, Genetic Diversity and Conservation, Species Diversity and Its Measurement, Indicator Species, Keystone Species, and Ecosystem Health. Study these first, then practise questions on each for Class 9 exams.
How should I revise Biodiversity for Class 9 exams?
Learn the core ideas first, then work through the 57 practice questions on Biodiversity. Revise 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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All ICSE Class 9 Environmental Science Syllabus

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