Energy & Environmental Engineering (ES-301) Unit 3 Notes

How unit 3 is examined

This unit covers what biodiversity is, its values and levels, India's mega-diversity and hotspots, the threats to it and its conservation; conservation, threats and the global/national/local levels carry the marks.

Introduction: definition, genetic, species and ecosystem diversity

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Definition. <mark>Biodiversity is the variety and variability of all living organisms on Earth, including the genes they carry, the species they form and the ecosystems they live in.</mark> The term was popularised by E. O. Wilson (1986).

Diagram.

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Key points.

Genetic diversity is the variation in genes within a single species; for example, thousands of rice varieties and hundreds of mango varieties in India differ in yield, taste and disease resistance.
Species diversity is the variety of species in a region, measured by species richness (number of species) and evenness (how equally individuals are spread among them); tropical forests have higher species diversity than deserts.
Ecosystem diversity is the variety of habitats and ecological processes in a region, such as forests, grasslands, deserts, wetlands, coral reefs and mangroves.
Genetic diversity lets a species adapt to disease and climate change, so its loss makes the species fragile.
Genetic diversity is lost mainly through habitat destruction, pollution, overexploitation, inbreeding in small populations, genetic drift, invasive species and replacement of local crop varieties by a few high-yield ones.
Biodiversity is conserved by in-situ methods (national parks, sanctuaries, biosphere reserves) and ex-situ methods (zoos, botanical gardens, seed and gene banks); it is needed for food, medicine, climate stability and ecosystem services.

Answer frame. Open with the definition; draw the three-box level diagram; develop genetic, species, ecosystem each with an Indian example; add loss factors and conservation in three lines if the question is the 3-part one; close with the need to conserve.

Asked: [7 marks] (Dec 2025) Define biodiversity and explain its different levels. Asked: [7 marks] (Dec 2025) What is Biodiversity? What are the major factors responsible for the loss genetic biodiversity? How can biodiversity be conserved?

Bio-geographical classification of India

Definition. Biogeographic classification divides India into regions of similar climate, terrain and flora-fauna; the Wildlife Institute of India recognises 10 biogeographic zones and 25 biotic provinces.

Key points.

The 10 zones are Trans-Himalaya, Himalaya, Desert, Semi-arid, Western Ghats, Deccan Peninsula, Gangetic Plain, Coasts, North-East and Islands.
Each zone has its own typical habitats and species, for example snow leopard in the Trans-Himalaya and lion-tailed macaque in the Western Ghats.
The classification helps planners place protected areas so that every type of habitat is represented.

Value of biodiversity: consumptive, productive, social, ethical, aesthetic and option values

Definition. The value of biodiversity is the benefit humans derive from it, directly or indirectly.

Key points.

Consumptive use value: goods used directly by local people without going to the market, such as fuelwood, fodder, fish and wild fruits.
Productive use value: products harvested and sold commercially, such as timber, rubber, silk, medicines and spices.
Social value: biodiversity is tied to festivals, religion and sacred groves and species (peepal, tulsi, cow).
Ethical value: every species has a right to exist irrespective of its use to humans.
Aesthetic value: beauty of landscapes and wildlife that supports ecotourism, art and recreation.
Option value: unknown potential of species, such as future drugs or crop genes, that may be useful later.

Biodiversity at global, national and local levels

Definition. <mark>Global, national and local biodiversity are the same variety of life viewed at three scales: the whole Earth, a country and a small region or community.</mark>

Key points.

Global level: about 1.7-1.8 million species are described, and estimates of the total run from 8 to 10 million or more; tropical regions hold most of them.
Globally biodiversity regulates climate, sequesters carbon, forms the common gene pool of crops and medicines, and maintains the biosphere's stability.
Global diversity is concentrated in 17 mega-diverse countries and in about 36 hotspots.
National level: India has about 2.4% of the world's land area but about 7-8% of its recorded species, including about 47,000 plant species and about 91,000 animal species.
India is one of the 17 mega-diverse nations, has 4 hotspots, about 33% endemic flowering plants and a network of national parks, sanctuaries and biosphere reserves.
Nationally it gives agricultural resilience (crop wild relatives, thousands of local varieties), economic resources (timber, medicine, fisheries, tourism) and wildlife heritage.
Local level: the diversity of a village, district or watershed, such as a wetland, sacred grove or farmland, which supports soil fertility, pollination, water purification, local livelihoods and cultural values.
Local diversity is the first to be damaged by human activity and the base on which national and global diversity are built.

Answer frame. Open with the definition and the three levels of biodiversity (genetic, species, ecosystem) for the 14-mark version; then take global, national (mega-diverse, hotspots, figures) and local in this order; for the 7-mark importance question, give two points per scale; close with the values (consumptive, productive, social, ethical, aesthetic, option).

Asked: [14 marks] (Nov 2019) What do you understand by the term "Biodiversity"? Explain biodiversity at National and local level of India. Asked: [7 marks] (Dec 2024) Describe the importance of biodiversity at global, national and local region.

India as a mega-diversity nation

Definition. <mark>A mega-diverse country is one that holds a very large share of the world's species and endemic species; 17 countries, including India, have been so identified.</mark>

Key points.

India covers only 2.4% of the world's land but holds about 7-8% of all recorded species, ranking among the top ten nations in plant diversity.
It has varied climate and landforms, from the Himalayas, deserts and plains to the coasts, islands and rainforests, giving 10 biogeographic zones.
It has a high level of endemism: about 33% of its flowering plants and many amphibians and reptiles are found nowhere else.
It is a centre of origin of crops such as rice, mango, banana, brinjal and many spices, and has many wild relatives of crops.
It has both Indomalayan and Palearctic fauna along with rich marine life across a coastline of about 7,500 km.
India has 4 biodiversity hotspots: the Himalaya, the Western Ghats (with Sri Lanka), Indo-Burma (North-East India) and Sundaland (Nicobar Islands).

Answer frame. Open with the definition and India's 2.4% versus 7-8% figure; then reasons 2-5; end by naming the 4 hotspots (the direct answer to "how many"); close with a line on their conservation priority.

Asked: [7 marks] (Dec 2023, Dec 2025) Why India is called a mega biodiversity Centre? How many hotspots are present in India? Discuss India as a mega-diversity nation and biodiversity hotspots.

Hotspots of biodiversity

Definition. A biodiversity hotspot is a region with at least 1,500 endemic vascular plant species that has lost at least 70% of its original habitat; the concept is by Norman Myers (1988).

Key points.

There are about 36 hotspots in the world, covering under 3% of land but holding more than half of all endemic plants.
India's 4 hotspots are the Himalaya, the Western Ghats and Sri Lanka, Indo-Burma and Sundaland (Nicobar).
Hotspots are given priority for conservation because they combine high endemism with high threat.

Threats to biodiversity: habitat loss, poaching, man-wildlife conflict

Definition. <mark>Threats to biodiversity are the natural and human-caused factors that reduce genes, species and ecosystems, the human causes (anthropogenic) being by far the larger.</mark>

Key points.

Habitat loss and fragmentation: deforestation, mining, dams, roads, urbanisation and farming destroy or split habitats, leaving isolated small populations; it is the largest single threat.
Poaching and overexploitation: illegal hunting for tusks, skins, bones, horns and bushmeat, for example tigers, rhinos (horn) and elephants (ivory), has pushed species to the brink.
Man-wildlife conflict: as forests shrink, elephants, tigers and leopards raid crops and kill livestock or people, and the villagers retaliate by killing the animals.
Pollution: pesticides, industrial waste, oil spills and plastics poison food chains; the decline of vultures due to the veterinary drug diclofenac is an example.
Invasive alien species: water hyacinth, Lantana and Parthenium outcompete native species and change habitats.
Climate change: warming and sea-level rise shift ranges, bleach coral reefs and endanger mountain and island species.
Population pressure and overexploitation of resources, and natural causes such as fire, floods and disease, add to the loss.
Consequences: lost species, reduced ecosystem services (crop pollination, water cycle, medicinal plants), food insecurity, health hazards and more natural disasters.

Answer frame. Open with the meaning of threats and split them into natural and anthropogenic; develop points 1-6 in this order with one Indian example each; add consequences (point 8); for the human-impact question, link each threat to genetic, species and ecosystem levels and then to ecosystem services and human well-being; close with the need for conservation.

Asked: [14 marks] (Nov 2019, Dec 2025) What are various threats to biodiversity? Explain. What are the major threats to biodiversity in India? Asked: [7 marks] (Dec 2024) How come the human involvement impact biodiversity at each level and state its consequences for ecosystem services and human well-being.

Endangered and endemic species of India

Definition. An endangered species is one facing a very high risk of extinction; an endemic species is found only in a particular region.

Key points.

The IUCN Red List categories run from extinct, extinct in the wild, critically endangered, endangered and vulnerable to near threatened.
Endangered animals of India include the Bengal tiger, Asiatic lion, one-horned rhinoceros, snow leopard, Great Indian Bustard and Ganges river dolphin.
Endemic species include the lion-tailed macaque and Nilgiri tahr (Western Ghats) and many Andaman and Nicobar birds and orchids.

Conservation of biodiversity: in-situ and ex-situ

Definition. <mark>In-situ conservation protects species in their natural habitat, whereas ex-situ conservation protects them outside their natural habitat, in man-made settings.</mark>

Diagram.

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Key points.

In-situ conservation keeps the whole ecosystem intact through national parks (no human activity), wildlife sanctuaries (limited human use), biosphere reserves (core, buffer and transition zones) and sacred groves; examples are Jim Corbett and Gir; Project Tiger (1973) is one programme.
Ex-situ conservation uses zoos, botanical gardens, aquaria, captive breeding, seed banks, gene banks and tissue culture; India's National Bureau of Plant Genetic Resources (NBPGR) holds the national seed bank.
In-situ merits: it is cheaper, conserves the whole ecosystem and lets species keep evolving and adapting.
In-situ limitations: it needs large areas, is exposed to poaching, disease and climate, and is not enough if the habitat is already destroyed.
Ex-situ merits: it saves critically endangered species, allows breeding and reintroduction, and enables research and public education.
Ex-situ limitations: it is costly, holds only a small gene pool, and animals lose natural behaviour and may not survive when released.
Community-based methods support both, for example the Bishnoi community's protection of trees and blackbuck, sacred groves, the Chipko movement and Joint Forest Management, along with ecotourism and sustainable livelihoods.
Laws such as the Wildlife Protection Act 1972 and Forest Conservation Act 1980, the Biological Diversity Act 2002 and international conventions such as CITES and the Convention on Biological Diversity give policy backing.
Ecosystem services (provisioning, regulating, cultural, supporting) depend on biodiversity, and their loss threatens human survival, so ecosystems must be managed sustainably.

Point	In-situ	Ex-situ
Place	Natural habitat	Outside habitat (zoo, garden, bank)
Examples	National park, sanctuary, biosphere reserve	Zoo, botanical garden, seed bank
Cost	Low	High
Scope	Whole ecosystem	Individual species or genes
Evolution	Continues naturally	Stops or is limited
Best for	Viable populations	Critically endangered species

Answer frame. For the comparison question: open with both definitions; draw the tree; give the table and then merits and limitations of each; close with the note that both are complementary. For the 14-mark question: define biodiversity and its levels, list the genetic-loss factors (habitat destruction, inbreeding depression, genetic drift, invasive species, climate change), then conservation. For approaches, community roles and ecosystem services: add points 7-9.

Asked: [7 marks] (Dec 2025) Explain in-situ and ex-situ conservation methods. Explain In-situ and Ex-situ conservation of biodiversity along with their merits and demerits. Asked: [14 marks] (Nov 2022) What is Biodiversity? What are the major factors responsible for the loss of genetic biodiversity? How can biodiversity be conserved? Asked: [7 marks] (Dec 2024) Discuss the importance of conservation and management of ecosystems for maintaining biodiversity and ecosystem services. Asked: [7 marks] (Dec 2024) Mention the different types of approaches and strategies for ecosystem conservation and management. Asked: [7 marks] (Dec 2024) Discuss in brief about the which local communities can contribute to conservation, including ecotourism, sustainable livelihoods and traditional knowledge with a suitable example.

Last-minute revision

Biodiversity = variety of life at genetic, species and ecosystem levels (E. O. Wilson popularised the term).
India: 2.4% of land, 7-8% of species, one of 17 mega-diverse nations.
India has 10 biogeographic zones and 25 biotic provinces.
India has 4 hotspots: Himalaya, Western Ghats, Indo-Burma, Sundaland (Nicobar).
Hotspot = at least 1,500 endemic plants and at least 70% habitat lost (Myers, 1988); about 36 in the world.
Values: consumptive, productive, social, ethical, aesthetic, option.
Main threats: habitat loss, poaching, man-wildlife conflict, pollution, invasive species, climate change.
In-situ = national parks, sanctuaries, biosphere reserves; ex-situ = zoos, botanical gardens, seed and gene banks.
Project Tiger 1973; Wildlife Protection Act 1972; Biological Diversity Act 2002.
Community examples: Bishnoi, Chipko, sacred groves, Joint Forest Management.
Ecosystem services: provisioning, regulating, cultural, supporting.

Memory hooks

Levels of biodiversity: "G-S-E" (Genes, Species, Ecosystems).
Values: "C-P-S-E-A-O" (Consumptive, Productive, Social, Ethical, Aesthetic, Option).
Threats: "HIPPO" (Habitat loss, Invasive species, Pollution, Population, Overexploitation).
India's hotspots: "HWIS" (Himalaya, Western Ghats, Indo-Burma, Sundaland).
In-situ = "on site", ex-situ = "off site".

Coverage checklist

Introduction – Definition: genetic, species and ecosystem diversity: Dec 2025 (both questions).
Bio-geographical classification of India: not asked recently; 10 zones covered.
Value of biodiversity: consumptive use, productive use, social, ethical, aesthetic and option values: not asked recently; six values covered.
Biodiversity at global, National and local levels: Nov 2019 (14), Dec 2024 (7).
India as a mega-diversity nation: Dec 2023, Dec 2025.
Hot-sports of biodiversity: not asked recently; definition and India's 4 covered.
Threats to biodiversity: habitat loss, poaching of wildlife, man-wildlife conflicts: Nov 2019 and Dec 2025 (14), Dec 2024 (7).
Endangered and endemic species of India: not asked recently; examples covered.
Conservation of biodiversity: In-situ and Ex-situ conservation of biodiversity: Nov 2022, Dec 2024 (three), Dec 2025.

Account

Energy & Environmental Engineering (ES-301) - Unit 3 Short Notes

How unit 3 is examined

Introduction: definition, genetic, species and ecosystem diversity

Bio-geographical classification of India

Value of biodiversity: consumptive, productive, social, ethical, aesthetic and option values

Biodiversity at global, national and local levels

India as a mega-diversity nation

Hotspots of biodiversity

Threats to biodiversity: habitat loss, poaching, man-wildlife conflict

Endangered and endemic species of India

Conservation of biodiversity: in-situ and ex-situ

Last-minute revision

Memory hooks

Coverage checklist