Biodiversity And Conservation | Class 11 Geography Notes
By ConceptScroll Team · Published on 17 July 2026 · 4 min read
Biodiversity And Conservation – this guide gives you a concise, exam-ready overview of Biodiversity And Conservation from Class 11 Geography, written by ConceptScroll editors and reviewed against the latest NCERT textbook.
Introduction to Biodiversity and Conservation
This chapter introduces the concept of biodiversity and its conservation as an essential part of the Earth's life system. Biodiversity refers to the variety and variability of life forms on Earth, encompassing plants, animals, and microorganisms, their genes, and the ecosystems they form. The chapter begins by linking biodiversity to geomorphic processes, particularly weathering and the weathering mantle, which vary with climatic zones. These variations influence vegetation diversity and thus biodiversity. The primary drivers of these variations are solar energy and water availability, making areas rich in these inputs hotspots of biodiversity. Biodiversity as we know it today is the result of 2.5 to 3.5 billion years of evolution. Historically, Earth supported more biodiversity before humans emerged. However, since humans appeared, biodiversity has been declining rapidly due to overexploitation and habitat destruction. Globally, species estimates range from 2 million to 100 million, with 10 million being the best estimate. Many species, especially freshwater fishes in South America, remain unclassified. Tropical forests are particularly rich in biodiversity. Biodiversity is unevenly distributed, richest in the tropics and decreasing towards the poles, where fewer species dominate larger populations. The term 'biodiversity' combines 'bio' (life) and 'diversity' (variety), referring to the number and variety of organisms in a geographic region, including genetic, species, and ecosystem diversity. It is our living wealth, shaped by millions of years of evolution.
📊 Diagram: Figure 14.1 shows grasslands and sholas in Indira Gandhi National Park, Annamalai, Western Ghats, illustrating ecosystem diversity with different vegetation types coexisting in one area.
🧪 Activity: Recapitulate geomorphic processes by reviewing Figure 5.2 from Chapter 5 to understand weathering mantle variations.
🔗 Connection: Leads to detailed discussion on the three levels of biodiversity: genetic, species, and ecosystem diversity.
Frequently asked questions
1. Multiple choice questions. (i) Conservation of biodiversity is important for : (a) Animals (c) Plants (b) Animals and plants (d) All organisms (ii) Threatened species are those which : (a) threaten others (b) Lion and tiger (c) are abundant in number (d) are suffering from the danger of extinction (iii) National parks and sanctuaries are established for the purpose of : (a) Recreation (c) Pets (b) Hunting (d) Conservation (iv) Biodiversity is richer in : (a) Tropical Regions (b) Polar Regions (c) Temperate Regions (d) Oceans (v) In which one of the following countries, the 'Earth Summit' was held? (a) the UK (b) Mexico (c) Brazil (d) China
(i) Conservation of biodiversity is important for (d) All organisms. Explanation: Biodiversity includes all forms of life including animals, plants, and microorganisms, all of which are important for ecosystem balance.
(ii) Threatened species are those which (d) are suffering from the danger of extinction. Explanation: Threatened species are those at risk of extinction due to various factors like habitat loss, hunting, etc.
(iii) National parks and sanctuaries are established for the purpose o
2. Answer the following questions in about 30 words. (i) What is biodiversity? (ii) What are the different levels of biodiversity? (iii) What do you understand by 'hotspots'? (iv) Discuss briefly the importance of animals to human kind. (v) What do you understand by 'exotic species'?
(i) Biodiversity is the variety of life forms on Earth including plants, animals, and microorganisms.
(ii) The different levels of biodiversity are genetic diversity, species diversity, and ecosystem diversity.
(iii) 'Hotspots' are regions with exceptionally high levels of endemic species and significant habitat loss.
(iv) Animals are important to humans for food, clothing, medicine, ecological balance, and cultural values.
(v) 'Exotic species' are species introduced to an area where they do
3. Answer the following questions in about 150 words. (i) What are the roles played by biodiversity in the shaping of nature? (ii) What are the major factors that are responsible for the loss of biodiversity? What steps are needed to prevent them?
(i) Biodiversity plays several roles in shaping nature. It maintains ecosystem stability by supporting food chains and nutrient cycles. Diverse species contribute to ecosystem services such as pollination, water purification, and climate regulation. Biodiversity also provides genetic resources for agriculture, medicine, and industry, and supports cultural and recreational values.
(ii) Major factors responsible for biodiversity loss include habitat destruction, pollution, overexploitation, invas
Project Work Collect the names of national parks, sanctuaries and biosphere reserves of the state where your school is located and show their location on the map of India.
This is a project work requiring students to research and list national parks, sanctuaries, and biosphere reserves in their state and mark them on the map of India. The solution involves: 1. Identifying the state. 2. Researching official sources or textbooks for protected areas in that state. 3. Listing the names of national parks, sanctuaries, and biosphere reserves. 4. Locating these areas on a blank map of India and marking them accurately. This exercise helps students understand biodiversity
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