Class 12 Biology - BIHAR
Biodiversity and Conservation
The chapter Biodiversity and Conservation in Class 12 Biology explores the immense variety of life on Earth at genetic, species, and ecological levels. For Bihar (BSEB) board exams, students must understand the patterns of biodiversity, why it is declining due to human activities, and the strategies used for its conservation, both in-situ and ex-situ. Questions from this chapter frequently appear as short-answer queries on national parks and biosphere reserves, as well as long-answer questions detailing the causes of biodiversity loss and the rivet popper hypothesis.
Start Learning FreeKey Concepts
Levels of Biodiversity
Biodiversity is categorized into three main levels: Genetic diversity (variation within species), Species diversity (diversity among species), and Ecological diversity (variety of ecosystems).
Latitudinal Gradients
Species diversity decreases as we move away from the equator towards the poles, making tropical regions hotspots for high biodiversity.
Causes of Biodiversity Loss
The 'Evil Quartet' represents the four major causes of biodiversity loss: Habitat loss and fragmentation, Over-exploitation, Alien species invasions, and Co-extinctions.
In-situ Conservation
The protection of endangered plants and animals in their natural habitats, such as national parks, wildlife sanctuaries, and biosphere reserves.
Ex-situ Conservation
The conservation of endangered species outside their natural habitats through methods like botanical gardens, zoological parks, cryopreservation, and seed banks.
Important Formulas
Board Exam Info
In the Bihar (BSEB) Class 12 Biology board exam, this chapter generally carries around 4-5 marks. Questions typically include objective (MCQ) questions on conservation methods, short-answer questions explaining the causes of biodiversity loss, and occasionally a long-answer question on in-situ vs. ex-situ conservation or the species-area relationship graph.
Frequently Asked Questions
What is the difference between In-situ and Ex-situ conservation?
In-situ conservation protects species inside their natural habitat (e.g., national parks), while ex-situ conservation protects them outside their natural habitat (e.g., zoos and botanical gardens).
What does 'Z' represent in the Species-Area relationship equation?
'Z' is the regression coefficient or slope of the line, which typically lies between 0.1 and 0.2 regardless of the taxonomic group or region.
Why are tropical regions richer in species diversity than temperate regions?
Tropics have remained relatively undisturbed for millions of years, receive more solar energy promoting higher productivity, and experience fewer seasonal variations.
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