L12: Bioresource & Use of Biodiversity
Applied Biology | CSIR-NET / GATE / DBT-JRF / ICAR-JRF / Biotechnology Notes
Detailed Study Notes + Important Concepts + 10 Interactive MCQs
📚 Index / Table of Contents
- Introduction to Bioresources and Biodiversity
- Bioresource: Definition and Meaning
- Types of Bioresources
- Importance and Uses of Bioresources
- Biodiversity: Meaning and Levels
- Genetic Diversity
- Species Diversity
- Ecosystem Diversity
- Biodiversity of India
- Biodiversity Hotspots of India
- Values of Biodiversity
- Major Threats to Biodiversity
- Biodiversity Conservation
- In-situ Conservation
- Ex-situ Conservation
- Sustainable Use of Bioresources
- Important Exam Points
- 10 MCQs – Interactive Quiz
1. Introduction to Bioresources and Biodiversity
The Earth contains an enormous variety of living organisms, ecosystems, genetic materials and biological products. Humans depend on these biological resources for food, medicine, clothing, agriculture, industrial products, energy and many other requirements. The term bioresource generally refers to biological material or living resources that can be utilized by humans or that possess ecological, economic, scientific or cultural value.
Biodiversity refers to the variety and variability of life at different biological levels. It includes variation within species, variation between species and variation among ecosystems. Biodiversity is therefore much broader than simply counting the number of species present in a particular region.
Bioresources and biodiversity are closely related. Biodiversity provides the biological foundation from which many bioresources are obtained. Plants, animals, microorganisms and genetic resources can all contribute useful products or services. For example, plants provide food, fibres, timber, medicines and industrial raw materials, while microorganisms are used in fermentation, enzyme production, antibiotics, biofertilizers and biotechnology.
2. Bioresource: Definition and Meaning
A bioresource can be considered any biological material, organism, population, genetic material or biological system that has actual or potential value to humans or ecosystems. Bioresources may be directly harvested from nature or developed and managed through agriculture, aquaculture, forestry, biotechnology and other activities.
Major characteristics of bioresources
- They originate from living organisms or biological systems.
- They may be renewable when properly managed.
- They can have economic, ecological, medicinal or cultural value.
- They can serve as sources of food, medicines, fibres and industrial materials.
- They can provide genetic material for crop and animal improvement.
- Microbial bioresources can be used for industrial biotechnology.
- Some bioresources have potential value that has not yet been discovered.
- Overexploitation can reduce their availability and threaten biodiversity.
3. Types of Bioresources
Bioresources can be classified in several ways depending on their origin, use and biological category. A simple classification is based on plants, animals, microorganisms and genetic resources.
3.1 Plant bioresources
- Food crops such as rice, wheat, maize and pulses.
- Medicinal plants such as neem, turmeric, tulsi and many other species.
- Timber-producing plants.
- Fibre-producing plants such as cotton and jute.
- Oil-producing plants.
- Plants used for spices, dyes, gums and resins.
- Ornamental and horticultural plants.
3.2 Animal bioresources
- Livestock such as cattle, buffalo, sheep and goats.
- Poultry and fisheries.
- Wild animals with ecological and genetic importance.
- Animal-derived products such as milk, wool and silk.
- Genetic resources used for breeding programmes.
3.3 Microbial bioresources
Microorganisms represent one of the most important and underexplored biological resources. Bacteria, fungi, algae and other microorganisms can produce enzymes, antibiotics, organic acids, pigments, vitamins, biofuels and many other useful compounds.
- Bacteria used in fermentation and industrial biotechnology.
- Fungi used for antibiotics, enzymes and food fermentation.
- Microalgae used for pigments, biofuels, food supplements and biotechnology.
- Yeasts used in bread, alcohol and industrial fermentation.
- Microbes used as biofertilizers and biocontrol agents.
3.4 Genetic resources
Genetic resources include genetic material of actual or potential value. These resources are extremely important for crop improvement, livestock breeding, disease resistance, climate adaptation and biotechnology.
- Wild relatives of crop plants.
- Traditional crop varieties.
- Landraces.
- Rare animal breeds.
- Microbial strains.
- Genetic variants with desirable characteristics.
4. Importance and Uses of Bioresources
Bioresources support almost every aspect of human society. Their importance extends from basic survival to advanced biotechnology. The economic value of biodiversity is often obvious in agriculture and forestry, but its ecological and future scientific value is equally important.
Food resources
- Plants provide cereals, pulses, vegetables, fruits, oilseeds and spices.
- Animals provide milk, eggs and other food products.
- Fish and aquatic organisms provide important protein resources.
- Microorganisms contribute to fermented foods.
Medicinal resources
- Many traditional medicines originate from plants.
- Microorganisms have produced important antibiotics and other metabolites.
- Natural products provide starting points for drug discovery.
- Genetic diversity may provide future disease-resistance traits.
Industrial applications
- Microbial enzymes are used in food, detergent and textile industries.
- Plant fibres are used in textiles and composite materials.
- Biological systems can be used for production of biofuels.
- Natural pigments and biomolecules can be used in food and cosmetics.
Agricultural importance
- Genetic diversity supports crop improvement.
- Wild relatives may provide disease resistance.
- Different varieties may show drought or salinity tolerance.
- Microbial resources can support nutrient cycling and plant growth.
5. Biodiversity: Meaning and Levels
Biodiversity is the variety of life at multiple levels of biological organization. It is commonly discussed at three major levels: genetic diversity, species diversity and ecosystem diversity.
Three major levels
- Genetic diversity: variation within a species.
- Species diversity: variety and relative abundance of species.
- Ecosystem diversity: variety of ecosystems and ecological communities.
Genetic → within species
Species → between species
Ecosystem → between ecosystems
6. Genetic Diversity
Genetic diversity refers to variation in genetic composition among individuals of the same species. Individuals belonging to the same species are not genetically identical. Differences in alleles and combinations of genes produce variation in characteristics such as size, colour, resistance to disease, environmental tolerance and biochemical properties.
Examples
- Different varieties of rice.
- Different breeds of cattle.
- Different strains of microorganisms.
- Wild and cultivated varieties of crop species.
- Different populations adapted to different environments.
Importance of genetic diversity
- Provides raw material for evolution.
- Improves adaptability to environmental changes.
- Supports crop and animal breeding.
- Can provide resistance to pests and diseases.
- May provide tolerance to drought, salinity and temperature stress.
7. Species Diversity
Species diversity describes the variety of species present in a community or geographical region. It is not determined only by the number of species. The relative abundance of different species is also important.
Species richness
Species richness refers to the number of different species present in an area. If one forest contains 100 species and another contains 50 species, the first forest has greater species richness, assuming the same sampling framework.
Species evenness
Species evenness refers to how evenly individuals are distributed among different species. A community containing many species but dominated by one species may have lower evenness than a community in which individuals are more equally distributed.
8. Ecosystem Diversity
Ecosystem diversity represents the variety of ecosystems, habitats and ecological processes within a geographical region. Ecosystems differ in their physical conditions, biological communities, nutrient cycles and ecological interactions.
- Forests
- Grasslands
- Deserts
- Wetlands
- Rivers
- Lakes
- Coastal ecosystems
- Mangroves
- Coral reef ecosystems
- Mountain ecosystems
9. Biodiversity of India
India is recognized as a biologically diverse country because of its large geographical area, varied climate, complex topography and wide range of ecosystems. The country contains mountains, forests, grasslands, deserts, wetlands, coastal regions, islands and marine ecosystems.
Variation in altitude, temperature, rainfall and soil conditions creates different ecological habitats. This environmental heterogeneity supports a large number of plant, animal and microbial species.
Major biodiversity-rich regions
- Himalayan region
- Western Ghats
- North-East India
- Andaman and Nicobar Islands
- Coastal and marine regions
- Desert and semi-arid ecosystems
- Central Indian forests
10. Biodiversity Hotspots of India
Biodiversity hotspots are regions characterized by exceptionally high levels of endemic biodiversity and significant habitat loss. The hotspot concept helps conservationists identify regions where conservation resources can have particularly high impact.
India overlaps with multiple globally recognized biodiversity hotspot regions. The commonly discussed hotspot regions associated with India include the Himalayan region, Indo-Burma region, Western Ghats and Sri Lanka region, and Sundaland, with the Indian Nicobar Islands forming part of the Sundaland hotspot.
| Hotspot / Region | Important Features | Why Important? |
|---|---|---|
| Himalayan region | High altitudinal variation and diverse habitats | Rich flora, fauna and endemic species |
| Indo-Burma | North-East associated ecosystems and diverse habitats | High biological and ecological diversity |
| Western Ghats–Sri Lanka | High rainfall, forests and strong endemism | Major centre of plant and animal diversity |
| Sundaland | Includes the Nicobar component of India's territory | High island biodiversity and endemism |
11. Values of Biodiversity
Biodiversity has many different types of value. Its importance cannot be expressed only through direct commercial benefits because ecosystems also provide essential ecological functions.
11.1 Consumptive use value
Consumptive use refers to resources directly consumed by people. Examples include food, fuelwood, medicinal plants and materials collected for household use.
11.2 Productive use value
Productive use refers to biological resources that are commercially harvested and traded. Examples include timber, pharmaceutical products, fibres, oils and other commercially valuable biological materials.
11.3 Ecological value
- Pollination
- Nutrient cycling
- Soil formation
- Carbon cycling
- Water purification
- Climate regulation
- Erosion control
- Maintenance of food webs
11.4 Genetic value
Genetic diversity has enormous potential value because genes present today may be useful for future breeding, biotechnology, medicine and adaptation to changing environmental conditions.
11.5 Cultural and aesthetic value
Biodiversity also has cultural, spiritual, recreational and aesthetic significance. Many societies have traditional relationships with plants, animals, forests, rivers and landscapes.
12. Major Threats to Biodiversity
Biodiversity is threatened by natural and human-induced processes. Anthropogenic activities have greatly accelerated habitat destruction, species decline and ecosystem degradation in many regions.
12.1 Habitat loss
Habitat loss occurs when natural habitats are converted into agricultural land, urban areas, roads, industries, mines or other human-dominated landscapes. It is one of the major causes of biodiversity decline.
- Deforestation
- Urban expansion
- Mining
- Infrastructure development
- Conversion of wetlands
- Large-scale agricultural expansion
12.2 Habitat fragmentation
Fragmentation occurs when a continuous habitat is divided into smaller isolated patches. Even if the total area of habitat loss is not extremely large, fragmentation can reduce connectivity between populations.
- Reduced gene flow
- Smaller population sizes
- Increased edge effects
- Difficulty in movement of animals
- Greater vulnerability to local extinction
12.3 Overexploitation
Overexploitation occurs when biological resources are harvested faster than their populations can recover.
- Overfishing
- Illegal wildlife hunting
- Excessive collection of medicinal plants
- Unsustainable timber extraction
12.4 Invasive species
Invasive species are non-native organisms that establish and spread in a new environment and can negatively affect native species or ecosystems. They may compete with native organisms, alter habitats, transmit diseases or change ecosystem processes.
12.5 Pollution
- Industrial pollutants
- Pesticides
- Plastics
- Sewage
- Heavy metals
- Air pollutants
- Oil contamination
12.6 Climate change
Changes in temperature, rainfall patterns, sea level and frequency of extreme events can affect species distributions and ecosystem processes. Species with limited tolerance ranges or restricted geographic distributions may be especially vulnerable.
- Habitat loss and fragmentation
- Overexploitation
- Invasive alien species
- Pollution
- Climate change
13. Biodiversity Conservation
Biodiversity conservation means protecting biological diversity and maintaining populations, genetic resources and ecosystems for present and future generations. Conservation involves scientific, social, economic and policy-based approaches.
Two fundamental strategies are in-situ conservation and ex-situ conservation.
| Feature | In-situ | Ex-situ |
|---|---|---|
| Meaning | Conservation within natural habitat | Conservation outside natural habitat |
| Examples | National parks, wildlife sanctuaries, biosphere reserves | Zoos, botanical gardens, seed banks, gene banks |
| Natural ecosystem processes | Maintained to a greater extent | Often managed artificially |
| Genetic processes | Natural population processes can continue | Population management may be required |
14. In-situ Conservation
In-situ conservation means conserving organisms within their natural habitats. This approach attempts to protect not only individual species but also their ecological interactions, evolutionary processes and associated communities.
Major examples
- National parks
- Wildlife sanctuaries
- Biosphere reserves
- Community-protected areas
- Sacred groves
- Protected forests
Advantages
- Protects organisms in their natural habitat.
- Maintains ecological interactions.
- Allows natural selection and evolutionary processes.
- Can conserve multiple species simultaneously.
- Protects habitats and ecosystem functions.
15. Ex-situ Conservation
Ex-situ conservation involves maintaining organisms or genetic material outside their natural habitats. It is particularly useful when a species is severely threatened in its natural environment or when specific genetic materials need to be stored safely.
Examples
- Zoos
- Botanical gardens
- Seed banks
- Gene banks
- Field gene banks
- Cryopreservation
- Microbial culture collections
- Tissue culture collections
Cryopreservation
Cryopreservation involves preservation of biological material at very low temperatures, commonly using liquid nitrogen systems. Cells, tissues, embryos, gametes and other biological materials can potentially be preserved for long-term storage when suitable protocols are available.
16. Sustainable Use of Bioresources
Conservation alone is not sufficient when biological resources are needed for human societies. The goal should be sustainable use, in which resources are utilized without destroying their ability to regenerate or without causing unacceptable ecological damage.
Principles of sustainable utilization
- Use renewable resources at sustainable harvesting levels.
- Prevent overexploitation of wild populations.
- Protect breeding populations and habitats.
- Promote cultivation of high-demand medicinal plants.
- Use biotechnology to reduce pressure on wild populations where appropriate.
- Promote community participation in resource management.
- Maintain genetic diversity.
- Monitor population size and ecosystem health.
- Control invasive species.
- Reduce pollution and habitat degradation.
Role of biotechnology in sustainable bioresource use
Biotechnology can help reduce pressure on natural populations by enabling controlled production of valuable biological products. Plant tissue culture, microbial fermentation, cell culture, molecular breeding, genetic conservation and cryopreservation are examples of technologies that can contribute to sustainable resource management.
- Plant tissue culture: rapid multiplication of selected plants.
- Microbial fermentation: production of enzymes, metabolites and bioactive compounds.
- Cryopreservation: long-term preservation of genetic material.
- DNA-based methods: characterization of genetic diversity.
- Marker-assisted approaches: identification of useful genetic traits.
- Bioremediation: biological treatment of environmental pollutants.
17. Important Exam Points
⭐ High-Yield Revision Points
- Biodiversity includes genetic, species and ecosystem diversity.
- Genetic diversity refers to variation within a species.
- Species richness is the number of species in a given area.
- Species evenness describes how evenly individuals are distributed among species.
- Ecosystem diversity refers to variety among ecosystems.
- In-situ conservation occurs in natural habitats.
- Ex-situ conservation occurs outside natural habitats.
- National parks are examples of in-situ conservation.
- Seed banks and gene banks are examples of ex-situ conservation.
- Genetic resources are important for breeding and future adaptation.
- Habitat loss and fragmentation are major causes of biodiversity decline.
- Overexploitation can reduce natural populations.
- Invasive alien species may negatively affect native biodiversity.
- Pollution can affect organisms and ecosystem processes.
- Climate change can shift species distributions and alter ecosystems.
- Biodiversity has ecological, economic, medicinal, genetic and cultural values.
- Sustainable utilization attempts to balance resource use with long-term conservation.
- Microorganisms are valuable bioresources for biotechnology and industrial production.
- Plant tissue culture can support multiplication and conservation of selected plant germplasm.
- Cryopreservation is useful for long-term preservation of biological materials.
18. Quick Comparison for Revision
| Term | Meaning | Example |
|---|---|---|
| Genetic diversity | Variation within a species | Different rice varieties |
| Species diversity | Variety of species | Different plant and animal species in a forest |
| Ecosystem diversity | Variety of ecosystems | Forest, desert, wetland |
| Species richness | Number of species | Number of bird species in a forest |
| In-situ conservation | Conservation in natural habitat | National park |
| Ex-situ conservation | Conservation outside natural habitat | Seed bank |
| Bioresource | Biological resource with actual or potential value | Medicinal plant or microbial strain |
| Genetic resource | Genetic material of actual or potential value | Crop landrace |
19. One-Minute Revision Notes
- Biodiversity = variety of life.
- Three levels = genetic + species + ecosystem.
- Genetic diversity = within species.
- Species diversity = among species.
- Ecosystem diversity = among ecosystems.
- Richness = number of species.
- Evenness = relative distribution of individuals.
- Bioresources include plants, animals, microbes and genetic resources.
- In-situ = natural habitat.
- Ex-situ = outside natural habitat.
- National park = in-situ.
- Seed bank = ex-situ.
- Habitat loss = major threat.
- Fragmentation = breaking continuous habitat into smaller patches.
- Overexploitation = extraction faster than regeneration.
- Invasive species = non-native species causing ecological problems.
- Pollution can reduce biodiversity.
- Climate change can alter species distribution.
- Sustainable use balances utilization and conservation.
20. Interactive MCQ Quiz – 10 Questions
Q1. Which of the following best describes biodiversity?
Q2. Variation among individuals of the same species represents:
Q3. Which of the following is an example of in-situ conservation?
Q4. Species richness refers to:
Q5. Which is an example of an ex-situ conservation method?
Q6. Which of the following is NOT a major threat to biodiversity?
Q7. Which of the following is a microbial bioresource?
Q8. Which biodiversity level describes differences among ecosystems?
Q9. Which statement about sustainable use of bioresources is correct?
Q10. Which of the following is an important value of biodiversity?
21. Final Revision: Bioresource & Biodiversity
Bioresources and biodiversity are fundamental concepts in applied biology, ecology, biotechnology and conservation biology. Biological diversity provides the genetic, species and ecosystem foundation required for the continued functioning of natural systems and for the development of biological products.
For examination purposes, it is important to clearly distinguish between genetic, species and ecosystem diversity. Genetic diversity occurs within species, species diversity concerns the variety of species, and ecosystem diversity concerns the variety of ecological systems.
Bioresources may include plants, animals, microorganisms and genetic materials. Their uses range from food and medicine to industrial biotechnology, agriculture and environmental applications. However, exploitation without appropriate management can lead to depletion of resources and biodiversity loss.
Conservation therefore requires both protection and responsible use. In-situ conservation protects organisms in their natural habitats, while ex-situ conservation maintains organisms or genetic materials outside those habitats. Both approaches can complement one another.
Sustainable utilization is especially important because human societies depend on biological resources. The objective is not simply to stop all resource use, but to ensure that utilization does not destroy the ecological systems and biological diversity on which future generations depend.
Biodiversity → Genetic + Species + Ecosystem
Conservation → In-situ + Ex-situ
Major threats → Habitat loss + Overexploitation + Invasive species + Pollution + Climate change
Sustainable use → Utilization + Regeneration + Conservation
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