Biodiversity — Chapter Summary
ICSE · Class 9 · Environmental Science
Summary of Biodiversity for ICSE Class 9 Environmental Science. Key concepts: Biodiversity refers, Genetic diversity is and Species diversity is.
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Overview
Biodiversity is the total variety of life and the interactions among organisms within ecosystems. It includes genetic differences within a species, the variety of different species, and the variety of ecosystems found on Earth. Biodiversity supports ecosystem stability, productivity, resilience, and
Key Concepts
Biodiversity refers to the total variety
Biodiversity refers to the total variety of life on Earth, including plants, animals, microorganisms, their genetic differences, and the ecosystems wh
Genetic diversity is the variation
Genetic diversity is the variation in genes within a single species or population. It arises through mutations, gene flow, genetic drift, and sexual r
Species diversity is the variety
Species diversity is the variety, number, and relative abundance of different species in an ecosystem. Species richness means the total number of spec
Ecosystem diversity is the variety
Ecosystem diversity is the variety of ecosystems, habitats, and ecological processes in an area or across the Earth. It includes terrestrial ecosystem
Indicator species reflect ecosystem health
Indicator species reflect ecosystem health and act as early warning signs of environmental change, while keystone species help maintain ecosystem bala
Learning Objectives
- Understand the meaning of biodiversity and its three main types.
- Differentiate between genetic diversity, species diversity, and ecosystem diversity.
- Recognise indicator species, keystone species, and their roles in ecosystem health.
- Explain food chains, food webs, trophic levels, and the 10% law of energy transfer.
- Describe major species interactions such as mutualism, commensalism, parasitism, predation, competition, and amensalism.
Frequently Asked Questions
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Sources & Official References
Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.
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