NCERT Solutions for Class 10 Science Chapter 15 Our Environment

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    NCERT Solutions for Class 10 Science Chapter 15 Our Environment is an essential learning aid for students to grasp the concepts covered in the chapter. The NCERT Solutions are designed by subject matter experts and align with the latest CBSE syllabus, making them an indispensable tool for CBSE students.

    The NCERT Solutions for Class 10 Science Chapter 15, "Our Environment," offer detailed and comprehensive answers to the questions provided in the textbook. By studying NCERT Solutions, students can understand the various components of the environment, the importance of the ecosystem, and the impact of environmental problems.

    This chapter covers essential topics such as the constituents of air, the importance of oxygen for living organisms, wind, the significance of air in the soil, and the atmosphere's role in plant growth and survival. The NCERT Solutions will help students to understand the complex interdependence of living and non-living things in the environment.

    The NCERT Solutions for Class 10 Science Chapter 15, "Our Environment," are designed to help students prepare for their CBSE Class 10 Science examination. By studying these solutions, students can gain in-depth knowledge of the subject, and the detailed answers to the questions will aid them in their exam preparation. These solutions will also help students develop an appreciation for the environment and encourage them to take proactive measures for its conservation.

    Topics Covered under NCERT Solutions for Class 10 Science Chapter 15 Our Environment

    NCERT Solutions for Class 10 Science Chapter 15, “Our Environment,” focuses on understanding our ecosystem, ecology, and the various aspects of our surroundings and their betterment.

    Concepts covered in the chapter:

    • Introduction to Ecosystem and Its Components
    • Food Chains and Webs
    • Energy Flow and Nutrient Cycling in the Ecosystem
    • Ozone Layer and How It is Getting Depleted
    • Harmful Effects of UV Rays and How to Protect Ourselves
    • Management of Natural Resources
    • Sustainable Management of Natural Resources
    • 3 R's - Reduce, Reuse, and Recycle

    NCERT Solutions for Class 10 Science Chapter 15 Intext Questions

    Page Number 260

    1. What are trophic levels? Give an example of food chain and state the different trophic levels in it.

    Ans. Trophic Levels: The various steps in a food chain at which the transfer of food (or energy) takes place are called trophic levels.

    Example: A food chain operating in a grassland is given below:

    Grass → Insects → Frog → Birds

    Our Environmentans1

    Trophic levels in a food chain

    Different trophic levels:

    1. Grass represents first trophic level, called producers.
    2. Grasshopper represents second trophic level, called primary consumers.
    3. Frog represents third trophic level, called secondary consumers.
    4. Eagle represents fourth tropic level, called tertiary consumers.

    2. What is the role of decomposers in the ecosystem?

    Ans. Various roles played by decomposers in ecosystem are:

    1. They decompose biodegradable substances to useful substance.
    2. They release nutrients into soil by decomposing dead and decaying matter to make soil fertile.
    3. They help in recycling of nutrient to the ecosystem.
    Page Number 262

    1. Why are some substances biodegradable and some non-biodegradable?

    Ans. Bio-degradable substances: The waste material which can be converted into its simpler form by the biological action of decomposers are called biodegradable substances.

    Example: All naturally produced materials such as paper.

    Non-biodegradable substances: The material which can breakdown by the action of decomposers are called non-biodegradable substances.

    Example: Synthetic substances such as plastic.

    2. Give any two ways in which biodegradable substances would affect the environment.

    Ans. 1. Biodegradable substances such as plant and food waste can be used as humus after composting. This increases the fertility of soil.

    2. These substances after decomposition, produce CO2 which is released back to the environment or atmosphere.

    3. Give any two ways in which non-biodegradable substances would effect the environment.

    Ans. 1. They contaminate soil and water, as they cannot be decomposed, hence they remain in ecosystem and cause  pollution. Example: Pesticides.

    2. These substances when accidentally eaten by animals can harm them and even cause death. Example: Polythene.

    Page Number 264

    1. What is ozone and how does it affect any  ecosystem ?

    Ans. Ozone is a molecule formed by combining three molecules of oxygen atom with molecular formula O3. It is present in stratosphere and provides protection against harmful rays coming from sun to earth such as ultraviolet

    2. How can you help in reducing the problem of waste disposal ? Give any two methods.

    Ans. 1. Recycling: The solid wastes like paper, plastics and metals, are recycled.

    2. Preparation of Compost: Biodegradable domestic wastes such as left over food, fruit, vegetable peels and leaves of potted plants, etc. can be converted into compost by burying in a pit dug into ground.

    NCERT Solutions for Class 10 Science Chapter 15 Exercise Questions

    1. Which of the following groups contain only biodegradable item?

    • (a) Grass, flowers and leather
    • (b) Grass, wood and plastic
    • (c) Fruit peels, cake and lime juice
    • (d) Cake, wood and grass

    Ans. (a) Grass, flowers and leather

    Explanation: Biodegradable material: Grass, flower, wood, lime juice.

    Non-Biodegradable material: Leather, plastic. Both options (b) and (c) are correct.

    2. Which of the following constitutes a food- chain?

    • (a) Grass, wheat and mango
    • (b) Grass, goat and human
    • (c) Goat, cow and elephant
    • (d) Grass, fish and goat
    • Ans. (b) Grass, goat and human

    Explanation: Grass acts as producer, goat acts as primary consumer and human acts as secondary or tertiary consumer in a food chain.

    3. Which of the following are environment friendly practices?

    • (a) Carrying cloth-bags to put purchases in while shopping
    • (b) Switching off unnecessary lights and fans
    • (c) Walking to school instead of getting your mother to drop on her scooter
    • (d) All of the above
    • Ans. (d) All of the above

    Explanation: All the above statements are environment friendly because it does not affect environment adversly.

    4. What will happen if we kill all the organisms in one trophic level?

    Ans. The food chain would end and ecological balance would be affected.

    1. If carnivores are killed, then the population of herbivores would increase to unsustainable level.
    2. If the herbivores are killed, then the carnivores would not be able to get food and would die.
    3. If producers are killed, then no tropic level is possible.

    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?

    Ans. Yes, the impact of removing all the organisms in a trophic level is different for different trophic levels. For e.g., if plants are removed from a food chain, no organism will get food as plants are the primary producers in food chain. If primary consumers are removed from a food chain the secondary consumers will starve and die and producers are also affected and may die due to competition for space and nutrients.

    It is not possible to remove a trophic level without causing damage to the ecosystem as they all are interlinked.

    6. What is biological magnification? Will the levels of this magnification be different at different levels of the ecosystem?

    Ans. 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.

    7. What are the problems caused by the non-biodegradable wastes that we generate?

    Ans. The problems caused by the non-biodegradable wastes are :

    1. They contaminate soil and water as they cannot be decomposed and deposit on the surface of earth and block the water and nutrients to go into the soil hence it causes soil and water pollution.
    2. These substance, when eaten by animals can harm them, and even cause death.

    8. If all the waste we generate is biodegradable, will this have no impact on the environment?

    Ans. Biodegradable wastes need to be decomposed within a particular period of time or else the accumulation of waste will lead again to pollution and affect environment accordingly.

    9. Why is damage to the ozone layer a cause for concern? What steps are being taken to limit this damage?

    Ans. The damage to the ozone layer is a cause of concern because it prevents UV-radiation coming from sun to earth which causes skin cancer.

    The steps that are being taken to limit this damage are very less or no use of chemicals which cause ozone depeletion. Such chemicals are CFCs (Chlorofluro carbons).

    Key Features of NCERT Solutions for Class 10 Science Chapter 15 Our Environment

    Thorough answers: The NCERT Solutions provide in-depth and comprehensive answers to the chapter's questions, enabling students to understand the subject matter more extensively.

    Simple language: The solutions use straightforward and easy-to-understand language, making them accessible to students of all levels.

    Authenticity: Prepared by subject matter experts, NCERT Solutions offer simple and appropriate answers that help students develop a deeper understanding of the subject.

    Versatility: NCERT Solutions can serve as a valuable resource for CBSE exams, Olympiads, and other competitive exams, helping students to prepare more effectively.

    Concise explanations: The solutions offer concise answers that simplify complex topics and make them easier to comprehend, allowing students to enhance their understanding of the subject matter.

    FAQs on NCERT Solutions for Class 10 Science Chapter 15 Our Environment

    Ans: Chapter 15 of NCERT Solutions for Class 10 Science includes 3 MCQs, 1 concise answer, 7 short answers, and 5 long answer type questions. Students can quickly answer concise answer-type questions in a single sentence.

    Ans: Students can download the PDF of NCERT Solutions for Class 10 Science Chapter 15, Our Environment, free from Oswal Publishers. The solutions are created based on the latest CBSE syllabus and guidelines and provide chapter-wise and exercise-wise PDF links to help students prepare for their CBSE exams. The answers are strictly based on the textbook prescribed by the CBSE board, and the solutions PDF can improve students’ logical reasoning and analytical thinking skills.

    Ans:Chapter 15 of NCERT Solutions for Class 10 Science discusses the concept of biological magnification, which is the accumulation of toxic chemical compounds in the body of living organisms at different trophic levels of the food chain. The solutions provide various examples to help students gain in-depth knowledge and understanding of the topic.

    Ans: NCERT Solutions for Class 10 Science Chapter 15, provided by Oswal Publishers, can help students prepare for CBSE exams, Olympiads, and other competitive exams. The solutions provide comprehensive answers to chapter questions in lucid language that is easy to understand.

    Ans: NCERT Solutions for Class 10 Science Chapter 15, provided by Oswal Publishers, includes only simple and appropriate answers. Using reliable sources, these solutions help students understand the chapter’s concepts clearly, providing a solid foundation for further studies.

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