- Understand the concept of biodiversity and its significance.
- Explain the different levels of biodiversity: genetic, species, and ecological diversity.
- Describe the distribution of biodiversity across the globe and factors influencing it.
- Identify major threats to biodiversity and their consequences.
- Discuss conservation strategies, including in situ and ex situ methods.
- Evaluate the importance of biodiversity for ecosystem services and human well-being.
- Analyze the role of biodiversity hotspots in conservation efforts.
Biodiversity and Conservation
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Revision Notes & Summary
TopBiodiversity and Conservation
1. Introduction to Biodiversity
- Biodiversity refers to the variety of life on Earth, encompassing species diversity, genetic diversity, and ecological diversity.
- Over 1.5 million species have been recorded, but estimates suggest nearly 6 million species may exist.
2. Importance of Biodiversity
- Biodiversity is crucial for ecosystem functioning and provides numerous ecosystem services such as:
- Pollination
- Pest control
- Climate moderation
- Flood control
- Ethical responsibility to conserve biodiversity for future generations.
3. Species Richness
- Species richness is highest in the tropics due to:
- More evolutionary time
- Constant environment
- Higher solar energy leading to greater productivity.
- Example: More than 70% of all recorded species are animals, with insects making up over 70% of animal species.
4. Causes of Species Loss
- Major causes include:
- Habitat loss and fragmentation
- Over-exploitation
- Biological invasions
- Co-extinctions
- Current extinction rates are 100 to 1000 times higher than historical rates.
5. Conservation Strategies
5.1 In Situ Conservation
- Protecting endangered species in their natural habitats.
- Example: India has 14 biosphere reserves, 90 national parks, and over 450 wildlife sanctuaries.
5.2 Ex Situ Conservation
- Protecting species outside their natural habitats.
- Methods include:
- Zoological parks
- Botanical gardens
- Cryopreservation of gametes
- Tissue culture propagation
6. Biodiversity Hotspots
- Areas with high species richness and endemism that require urgent conservation efforts.
- India has three major hotspots:
- Western Ghats and Sri Lanka
- Himalaya
- Indo-Burma
7. Conclusion
- Biodiversity conservation is a collective responsibility of all nations, emphasized by international agreements like the Convention on Biological Diversity.
Practice Test – MCQs, True/False
TopMultiple Choice Questions
A.
Birds
B.
Mammals
C.
Amphibians
D.
Gymnosperms
Correct Answer: C
Solution:
Amphibians face the highest threat of extinction with 32% of species at risk.
Chapter Concept:
Extinction Rates, IUCN Red List and Sixth Extinction
A.
Different species of beetles
B.
Various types of ecosystems in India
C.
Rauwolfia vomitoria showing variation in reserpine concentration
D.
The number of bird species in Colombia
Correct Answer: C
Solution:
Genetic diversity refers to variation at the genetic level within a species. Rauwolfia vomitoria shows genetic diversity in terms of reserpine concentration across different Himalayan ranges.
Chapter Concept:
Genetic Diversity
A.
784 species
B.
1000 species
C.
500 species
D.
1500 species
Correct Answer: A
Solution:
The IUCN Red List 2004 records 784 extinctions in the last 500 years, including 338 vertebrates, 359 invertebrates, and 87 plants.
Chapter Concept:
Extinction Rates, IUCN Red List and Sixth Extinction
A.
Species diversity
B.
Ecological diversity
C.
Genetic diversity
D.
Biochemical diversity
Correct Answer: C
Solution:
Genetic diversity refers to the variation in genes within a particular species, as seen in the different strains of Rauwolfia vomitoria.
Chapter Concept:
Biodiversity
A.
Colombia
B.
India
C.
New York
D.
Greenland
Correct Answer: A
Solution:
Colombia, located near the equator, has about 1,400 species of birds.
Chapter Concept:
Latitudinal Gradients in Biodiversity
A.
Pollination
B.
Industrial production
C.
Urban development
D.
Space exploration
Correct Answer: A
Solution:
Biodiversity provides essential ecosystem services such as pollination, which is crucial for plant reproduction.
Chapter Concept:
Importance of Biodiversity
A.
Increased genetic diversity
B.
Population declines in species requiring large territories
C.
Decreased species extinction rates
D.
Improved ecosystem stability
Correct Answer: B
Solution:
Habitat fragmentation leads to population declines in species requiring large territories and those with migratory habits.
Chapter Concept:
Ecological Diversity
A.
1.5 million
B.
7 million
C.
20 million
D.
50 million
Correct Answer: B
Solution:
Robert May estimated the global species diversity to be about 7 million.
Chapter Concept:
Global and Indian Biodiversity Inventory
A.
0.1
B.
0.5
C.
1.15
D.
2.0
Correct Answer: C
Solution:
In tropical forests, the slope (Z) value for frugivorous birds and mammals in the species-area relationship is typically 1.15.
Chapter Concept:
Species-Area Relationship
A.
Ecological diversity
B.
Biodiversity
C.
Species diversity
D.
Genetic diversity
Correct Answer: B
Solution:
Edward Wilson popularized the term 'biodiversity', which encompasses diversity from macromolecules to biomes.
Chapter Concept:
Biodiversity
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Biodiversity and Conservation
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Locked • AI Weakness TrackerTrue or False
Correct Answer: True
Solution:
The current extinction rates are indeed 100 to 1000 times faster than pre-human times, and this accelerated rate of species loss is termed the Sixth Extinction.
Chapter Concept :
Extinction Rates, IUCN Red List and Sixth Extinction
Correct Answer: True
Solution:
The concept of latitudinal gradients in biodiversity states that species diversity decreases from the equator towards the poles. This is due to factors such as longer evolutionary time without glaciations, less seasonal and more predictable environments, and higher solar energy in the tropics.
Chapter Concept :
Latitudinal Gradients in Biodiversity
Correct Answer: True
Solution:
Biodiversity plays a crucial role in providing ecosystem services that are vital for maintaining ecological balance and supporting human well-being.
Chapter Concept :
Importance of Biodiversity
Correct Answer: True
Solution:
Biodiversity is the combined diversity at all levels of biological organisation, including genetic diversity, species diversity, and ecological or ecosystem diversity.
Chapter Concept :
Biodiversity
Correct Answer: True
Solution:
The Western Ghats are noted for having a higher diversity of amphibian species compared to the Eastern Ghats, as highlighted in the text.
Chapter Concept :
Species Diversity
Correct Answer: True
Solution:
The Nile perch, an alien species, was introduced into Lake Victoria and caused the extinction of more than 200 species of cichlid fish due to its invasive nature.
Chapter Concept :
Causes of Biodiversity Loss
Correct Answer: True
Solution:
Biodiversity is defined as the combined diversity at all levels of biological organization, including genetic diversity, species diversity, and ecological or ecosystem diversity.
Chapter Concept :
Biodiversity
Correct Answer: True
Solution:
Genetic diversity refers to the variation at the gene level within a species across its distributional range. India is noted for having more than 50,000 genetically different strains of rice, which exemplifies this concept.
Chapter Concept :
Genetic Diversity
Correct Answer: True
Solution:
Ecological diversity indeed refers to the variety of ecosystems within a region, such as deserts, rainforests, and coral reefs in India.
Chapter Concept :
Ecological Diversity
Correct Answer: True
Solution:
The latitudinal gradient in biodiversity indicates that species diversity decreases from the equator to the poles, with the tropics harboring more species than temperate or polar areas.
Chapter Concept :
Latitudinal Gradients in Biodiversity
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