NCERT Solutions Class 11 Geography Chapter 15 Life On the Earth– Here are all the NCERT solutions for Class 11 Geography Chapter 15. This solution contains questions, answers, images, explanations of the complete chapter 1 titled Of Life On the Earth taught in Class 11. If you are a student of Class 11 who is using NCERT Textbook to study Geography, then you must come across chapter 15 Life On the Earth After you have studied lesson, you must be looking for answers of its questions. Here you can get complete NCERT Solutions for Class 11 Geography Chapter 15 Life On the Earth in one place.
NCERT Solutions Class 11 Geography Chapter 15 Life On The Earth
Here on AglaSem Schools, you can access to NCERT Book Solutions in free pdf for Geography for Class 11 so that you can refer them as and when required. The NCERT Solutions to the questions after every unit of NCERT textbooks aimed at helping students solving difficult questions.
For a better understanding of this chapter, you should also see summary of Chapter 15 Life On The Earth , Geography, Class 11.
|Book||Fundamentals Of Physical Geography|
Life On The Earth
NCERT Solutions Class 11 Geography chapter 15 Life On The Earth
Class 11, Geography chapter 15, Life On The Earth solutions are given below in PDF format. You can view them online or download PDF file for future use.
Life On The Earth
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Question & Answer
Q.1: Multiple choice questions. (i) Which one of the following is included in biosphere? (a) only plants (b) all living and nonliving organisms (c) only animals (d) all living organisms (ii) Tropical grasslands are also known as : (a) the prairies (b) the savannas (c) the steppes (d) none of the above (iii) Oxygen combines with iron found in the rocks to form : (a) iron carbonate (b) iron nitrites (c) iron oxides (d) iron sulphate (iv) During photosynthesis, carbon dioxide combines with water in the presence of sunlight to form : (a) proteins (b) amino acids (c) carbohydrates (d) vitamins
Ans : (i) (b) all living and nonliving organisms (ii) (b) the savannas (iii) (c) iron oxides (iv) (c) carbohydrates
Q.2: Answer the following questions in about 30 words. (i) What do you understand by the term ‘ecology’? (ii) What is an ecological system? Identify the major types of ecosystems in the world. (iii) What is a food-chain? Give one example of a grazing food-chain identifying the various levels. (iv) What do you understand by the term ‘food web’? Give examples. (v) What is a biome?
Ans : (i) Ecology is a scientific study of the interactions of organisms with their physical environment and with each other. (ii) The interactions of a particular group of organisms with abiotic factors within a particular habitat resulting in clearly defined energy flows and material cycles on land, water and air, are called ecological systems. Ecosystems are of major types:
(iii) These sequence of eating and being eaten and the resultant transfer of energy from one level to another is known as the food-chain. Grass (first level) is eaten by deer (intermediate level) is eaten by lion (last level). (iv) A network of food chains mixed together to form a food web. For example, a mouse feeding on grain may be eaten by different secondary consumers (carnivores) and these carnivores may be eaten by other different tertiary consumers (top carnivores). (v) A biome is a plant and animal community that covers a large geographical area.
Q.3: Answer the following questions in about 150 words. (i) What are biogeochemical cycles? Explain how nitrogen is fixed in the atmosphere. (ii) What is an ecological balance? Discuss the important measures needed to prevent ecological imbalances?
Ans : (i) The balance of the chemical elements is maintained by a cyclic passage through the tissues of plants and animals. The cycle starts by absorbing the chemical elements by the organism and is returned to the air, water and soil through decomposition. These cycles are largely energised by solar insolation. The cyclic movements of chemical elements of the biosphere beüeen the organism and the environment are referred to as biogeochemical cycles. Bio refers to living organisms and geo to rocks, soil, air and water of the earth. Ninety per cent of fixed nitrogen is biological. The principal source of free nitrogen is the action of soil microorganisms and associated plant roots on atmospheric nitrogen found in pore spaces of the soil. Nitrogen can also be fixed in the atmosphere by lightning and cosmic radiation. In the oceans, some marine animals can fix it. (ii) Ecological balance is a state of dynamic equilibrium within a community of organisms in a habitat or ecosystem. It can happen when the diversity of the living organisms remains relatively stable. Ecological imbalances: Ecological balance may be disturbed due to the introduction of new species, natural hazards or human causes. The important measures to prevent ecological imbalances are:
Proper knowledge and management are necessary for protecting and conserving the ecosystems.
- By not interfering in nature.
- By controlling population.
- By reusing and recycling things.
- By using natural resources judiciously.
- Afforestation should be encouraged.
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