- 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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Learning Objectives
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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.
The aesthetic pleasure of natural landscapes.
B.
The production of oxygen by the Amazon rainforest.
C.
The cultural significance of sacred groves.
D.
The pollination of crops by bees and other pollinators.
Correct Answer: D
Solution:
Pollination of crops by bees and other pollinators is a direct ecological service provided by biodiversity, which is crucial for agricultural productivity and has significant economic impact.
Chapter Concept:
Importance of Biodiversity
A.
Fungi species are fewer than vertebrate species.
B.
Fungi species exceed the combined number of fishes, amphibians, reptiles, and mammals.
C.
Fungi are less diverse than plants.
D.
Fungi have the same diversity as insects.
Correct Answer: B
Solution:
Fungi species exceed the combined total of fishes, amphibians, reptiles, and mammals.
Chapter Concept:
Global and Indian Biodiversity Inventory
A.
0.1 - 0.2
B.
0.3 - 0.5
C.
0.6 - 1.2
D.
1.3 - 1.5
Correct Answer: C
Solution:
For very large areas such as continents, the slope (Z) of the species-area relationship is typically in the range of 0.6 to 1.2.
Chapter Concept:
Species-Area Relationship
A.
Increased genetic diversity
B.
Increased species richness
C.
Decline in populations of large mammals and birds
D.
Improved ecosystem stability
Correct Answer: C
Solution:
Habitat fragmentation leads to smaller, isolated patches of habitat, which can negatively impact species that require large territories or have migratory habits, leading to population declines.
Chapter Concept:
Causes of Biodiversity Loss
A.
Mammals
B.
Birds
C.
Insects
D.
Fungi
Correct Answer: C
Solution:
Insects form over 70% of the recorded animal species.
Chapter Concept:
Global and Indian Biodiversity Inventory
A.
B.
C.
D.
Correct Answer: C
Solution:
The species-area relationship on a logarithmic scale is represented by the equation .
Chapter Concept:
Species-Area Relationship
A.
Species richness decreases productivity.
B.
Species richness has no effect on productivity.
C.
Species richness increases productivity up to a certain area limit.
D.
Species richness only affects productivity in temperate regions.
Correct Answer: C
Solution:
The species-area relationship suggests that species richness increases with area, enhancing productivity up to a certain limit.
Chapter Concept:
Species Diversity and Ecosystem Stability
A.
Increased biodiversity
B.
Extinction of over 200 cichlid fish species
C.
Improved water quality
D.
Expansion of aquatic plant life
Correct Answer: B
Solution:
The introduction of the Nile perch into Lake Victoria led to the extinction of more than 200 species of cichlid fish.
Chapter Concept:
Causes of Biodiversity Loss
A.
Biodiversity provides a wide range of genetic material that can be utilized for crop improvement.
B.
Biodiversity ensures the stability and resilience of ecosystems to environmental changes.
C.
Biodiversity increases the aesthetic value of natural landscapes.
D.
Biodiversity reduces the need for human intervention in ecosystem management.
Correct Answer: B
Solution:
Biodiversity ensures the stability and resilience of ecosystems by providing functional redundancy and a variety of species that can adapt to changes, thus maintaining ecosystem services.
Chapter Concept:
Importance of Biodiversity
A.
Western Ghats
B.
Himalayas
C.
Indo-Burma
D.
Amazon Rainforest
Correct Answer: D
Solution:
The Amazon Rainforest is not in India and is not one of the biodiversity hotspots in the country.
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 Western Ghats are known for their higher amphibian species diversity compared to the Eastern Ghats, as mentioned in the text.
Chapter Concept :
Species Diversity
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:
David Tilman's long-term experiments demonstrated that plots with more species showed less year-to-year variation in biomass and higher productivity, indicating that species diversity contributes to ecosystem stability.
Chapter Concept :
Species Diversity and Ecosystem Stability
Correct Answer: False
Solution:
The species-area relationship observed by Alexander von Humboldt shows that species richness increases with area only up to a certain limit, not indefinitely.
Chapter Concept :
Species-Area Relationship
Correct Answer: True
Solution:
The Nile perch, an alien species, caused the extinction of over 200 cichlid fish species in Lake Victoria due to its invasive nature.
Chapter Concept :
Causes of Biodiversity Loss
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: False
Solution:
The decline of tropical rainforests is primarily due to human activities such as deforestation for soya bean cultivation and cattle ranching.
Chapter Concept :
Causes of Biodiversity Loss
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:
India is recognized as one of the 12 megadiversity countries, contributing significantly to global biodiversity despite its relatively small land area.
Chapter Concept :
Global and Indian Biodiversity Inventory
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
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