Questions
3 questions per exam
Difficulty
Easy
Importance
Conceptual core — essential for marks
Overview
Biodiversity and Conservation explores the immense variety of life forms on Earth and the urgent need to protect them from extinction. For board exams, this topic is critical as it connects ecological theory with real-world environmental policy, requiring a grasp of both patterns of diversity and strategies for habitat restoration.
Levels of Biodiversity
Biodiversity is categorized into three distinct hierarchical levels which define the biological wealth of a region. Understanding these levels is essential for answering questions about how genetic, species, and ecosystem diversity interact to maintain biosphere stability.
- Genetic diversity: Variation at the gene level in a single species (e.g., Rauwolfia vomitoria)
- Species diversity: Variation of species within a region (e.g., Western Ghats vs. Eastern Ghats)
- Ecological diversity: Variation at the ecosystem level (e.g., deserts, mangroves, coral reefs)
- India's global status: One of the 12 mega-diversity countries
Loss of Biodiversity
The rapid decline of biodiversity is primarily driven by human-induced factors, collectively known as the 'Evil Quartet'. Examiners often ask students to identify these causes and explain the impact of extinction on food chains.
- Habitat loss and fragmentation: The most important cause of extinction
- Over-exploitation: Excessive consumption of biological resources
- Alien species invasion: Introduction of exotic species (e.g., Nile Perch in Lake Victoria)
- Co-extinction: Extinction of one species leads to the obligate extinction of another
- IUCN Red List: The global index for documenting endangered species
Conservation Strategies
Conservation is divided into in-situ and ex-situ approaches to preserve endangered flora and fauna. Differentiating between these methods based on the location of the organism is a frequent exam point.
- In-situ conservation: Protection within natural habitats (National Parks, Sanctuaries, Biosphere Reserves)
- Ex-situ conservation: Protection outside natural habitats (Zoological parks, Botanical gardens, Seed banks)
- Hotspots: Regions with high levels of species richness and high degree of endemism
- Sacred groves: Traditional cultural conservation practices in India
Formula Sheet
Species-Area Relationship: log S = log C + Z log A
Exam Tip
Always memorize the difference between National Parks and Wildlife Sanctuaries, as this is a high-probability comparative question.
Common Mistakes
- Confusing in-situ conservation examples with ex-situ methods in MCQ matching questions
- Failing to mention the specific definition of 'Endemism' when discussing biodiversity hotspots
- Listing general pollution as a primary cause without referencing the 'Evil Quartet' nomenclature
More Revision Notes
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