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NCERT Solutions for Class 10 Science Chapter 15 Our Environment - Learn CBSE
in 10th Class. 0. Share on Facebook Share on Twitter. NCERT Solutions for Class 10 Science are given for the students so that they can get to know the answers to the questions in case they are not able to find it. It is important for all the students who are in Class 10 currently.� Through these, they can get answers to those questions on which they get stuck. These are the valid solutions and students can check these whenever they face any confusion in the questions. NCERT Solutions Subject wise. We are giving the subjectwise solution of NCERT Class 10 books.� You can also check out NCERT Solutions of other classes here. Click on the class number below to go to relevant NCERT Solutions of Class 1, 2, 3, 4, 5, 6, 7, 9, 9, 10, 11, Political Science Class 11 Important Questions with Answers. Business Studies Class 11 Important Questions with Answers. Important Extra Questions for Class � By solving the NCERT Extra Questions Solutions PDF, students can ace up their preparation & score good grades in board exams. 2. Where can I find 6th to 12th Class NCERT Extra Questions and Answers for all subjects? myboat010 boatplans helps students to find all subjects NCERT extra questions solutions PDF for class 12th to class 6th in direct links for easy access while preparing for the board exams. 3. Can I download NCERT CBSE Extra Questions Solutions in PDF format? Yes, you can download NCERT Class 6 to Class 12 Extra Questions and Answers in PDF format for free from our page. You can download Class 10 Science Chapter 1 question answer/Chemical Reactions and Equations Class 10 questions answers PDF from below. Download � NCERT Solutions For Class 10 Science Chapter 1 PDF. NCERT Solutions For Class 10 Science Chapter 2: Acids, Bases, And Salts.� Read the prescribed NCERT Science textbooks exhaustively. This is important as the CBSE 10th board exam Science question paper is based on this book. Revise all the topics regularly so that you do not face difficulty in recalling any topic before the exam. Make notes of key concepts on the computer or on paper. These will help you in learning the concepts faster and also act as quick reference material.

Also, students can find our environment class 10 extra questions and answers. Question 1 What are trophic levels? Give an example of food chain and state the different trophic levels in it. Answer: Trophic Levels : The various steps in a food chain at which the transfer of food or energy takes place are called trophic levels.

Question 2 What is the role of decomposers in the ecosystem? Answer: i Decomposers help in decomposing the dead bodies of plants and animals and hence act as cleansing agents of the environment. Question 1 Why are some substances biodegradable and some non-biodegradable?

Answer: The microorganism like bacteria and other decomposer organisms called saprophytes present in our environment are specific in their action. They break down the materials or products made from natural materials say, paper but do not break down man-made materials such as plastics.

So, it is due to the property of decomposer organisms of being specific in their action that some waste materials are biodegradable, whereas others are non-biodegradable. Question 2 Give any two ways in which biodegradable substances would affect the environment. Answer: i Biodegradable substances are decomposed by the action of microorganisms and decomposed materials are recycled through geo-chemical cycle.

Question 3 Give any two ways in which non-biodegradable substances would effect the environment. Answer: i They cause air, water and soil pollution. Question 1 What is ozone and how does it affect any ecosystem? Answer: Ozone O 3 is an isotope of oxygen, i. At the higher levels of the atmosphere, ozone performs an essential function.

It shields the surface of the earth from ultraviolet UV radiations from the sun. These radiations are highly damaging to organisms. Ultraviolet rays can cause skin cancer. Question 2 How can you help in reducing the problem of waste disposal? Give any two methods. Answer: i Recycling : The solid wastes like paper, plastics and metals, etc. Question 1 Which of the following groups contain only biodegradable item?

Question 2 Which of the following constitutes a food-chain? Question 3 Which of the following are environment friendly practices? Question 4 What will happen if we kill all the organisms in one trophic level? Answer: The food chain would end and ecological balance would be affected. Question 5 Will the impact of removing all the organisms in a trophic level be different for different trophic levels? Can the organisms of any trophic level be removed without causing any damage to the ecosystem?

Answer: Yes, the impact of removing all the organisms in a trophic level will be different for different trophic levels. For example, on removing producers; herbivores would not be able to survive or they would migrate and ecosystem would collapse. If herbivores are removed, producers would grow unchecked and carnivores would not get food.

If carnivores are removed, herbivores would increase to unsustainable levels and could destroy the producers. If decomposers are removed, the dead animals would pile up due to which the environment would become polluted.

In addition to this, if dead animals will not decompose, the recycling of nutrients in the soil will be stopped and its fertility will be reduced. As a result the green cover of the earth will be lost. Thus to maintain the balance of the ecosystem the presence of organisms is necessary at each trophic level. Question 6 What is biological magnification?

Will the levels of this magnification be different at different levels of the ecosystem? Answer: Biological magnification : The increase in concentration of harmful chemical substances like pesticides in the body of living organisms at each trophic level of a food chain is called biological magnification. Yes, levels of bio-magnification would increase as the trophic level increases and would be the highest for topmost trophic level.

It would affect their biological process such as growth, reproduction, etc. Question 7 What are the problems caused by the non-biodegradable wastes that we generate? Answer: The problems caused by the non-biodegradable wastes are :.

Question 8 If all the waste we generate is biodegradable, will this have no impact on the environment? If it is disposed off properly, the problem of air, water and soil pollution can be lessened to an extent. There would be less health problems and humans would be disease-free. But if it is not disposed off properly, it will affect the environment adversely. Question 9 Why is damage to the ozone layer a cause for concern?

What steps are being taken to limit this damage? Answer: The damage to the ozone layer is a cause for concern because if the ozone layer in the atmosphere disappears completely, then all the extremely harmful ultraviolet radiations coming from the sun would reach the earth. These ultraviolet radiations would cause skin cancer and other ailments in men and animals and also damage the plants. Our environment: Eco-system, Environmental problems, Ozone depletion, waste production and their solutions.

Biodegradable and non-biodegradable substances. Formulae Handbook for Class 10 Maths and Science. Question 1.

Why are some substances biodegradable and some non-biodegradable? Answer: Substances that are broken down by biological processes are said to be biodegradable. In our environment, many of the substances are broken easily by decomposers bacteria and fungi as they possess specific enzymes for such activity.

However, there are other substances also which are not broken down in this manner and are known as non-biodegradable substances. Since these substances are not degraded by bacteria and fungi, so they persist for a long time. These non-biodegradable substances will be acted upon by physical processes like heat and pressure.

Question 2. Give any two ways in which biodegradable substances would affect the environment. Question 3. Give any two ways in which non-biodegradable substances would affect the environment. What are trophic levels? Give an example of a food chain and state the different trophic levels in it. Answer: Each step or level of the food chain forms a trophic level. Consider the following food chain:. What is the role of decomposers in the ecosystem? Answer: Role of decomposers in the ecosystem :.

What is ozone and how does it affect any ecosystem? Answer: Ozone O 3 is a molecule formed by three atoms of oxygen. At the higher of the atmosphere, it shields the surface of the earth from ultraviolet UV radiation from the Sun. It may affect any ecosystem in the following ways :. How can you help in reducing the problem of waste disposal?

Give any two methods? Which of the following groups contain only biodegradable items? Which of the following constitute a food-chain? Which of the following are environment-friendly practices? Question 4. What will happen if we kill all the organisms in one trophic level? Answer: If we kill all the organisms in one trophic level, then transfer of energy as well as matter to next higher level will stop. It will lead to over- population at one particular level causing amongst the individuals.

This would seriously disturb the food chain and can cause the collapse of an ecosystem even. Question 5. Will the impact of removing all the organisms in a trophic level be different for different trophic levels? Answer: Yes, the impact Of removing all the Organisms in a trophic level will be different for different trophic levels.

It will not be possible to remove any organism in any trophic level without causing damage to the ecosystem. Question 6. What is biological magnification? Answer: The accumulation of harmful chemicals in the body of living organisms at different trophic levels in a food chain is called biological magnification.

Yes, the concentration of these harmful chemicals will be different at different trophic levels. It will be maximum at the last trophic levels which is mostly of the top carnivores quaternary consumers. Question 7. What are the problems caused by the non-biodegradable wastes that we generate? Answer: i Non-biodegradable wastes persist in the environment for a long time and cause greater harm to the various members of the ecosystem by causing biological magnification.

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Qnswer YMBAB, by a learn shipwright, JJ Henry. A simple judgment at the back of you do this endeavour is to check a disproportion in swell of plants by provision them H2O with assorted pH values.

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