13. Our Environment Class 10 Science [LATEST] Solutions Additional Questions With Solutions in english - CBSE Study
NCERT Solutions for Class 10 Science are carefully prepared according to the latest CBSE syllabus and NCERT textbooks to help students understand every concept clearly. These solutions cover all important 13. Our Environment with detailed explanations and step-by-step answers for better exam preparation. Each Additional Questions With Solutions is explained in simple language so that students can easily grasp the fundamentals and improve their academic performance. The study material is designed to support daily homework, revision practice, and final exam preparation for Class 10 students. With accurate answers, concept clarity, and structured content, these NCERT solutions help learners build confidence and score higher marks in their examinations. Whether you are revising a specific topic or preparing an entire chapter, this resource provides reliable and syllabus-based guidance for complete success in Science.
Class 10 English Medium Science All Chapters:
13. Our Environment
4. Additional Questions With Solutions
Chapter 13: Our Environment
Extra Important Questions with Answers
Q1. What is meant by the environment?
Answer: The environment is the surroundings in which living organisms exist and interact with one another as well as with non-living components.
Q2. What are the two main components of the environment?
Answer: The two main components of the environment are biotic components (living organisms) and abiotic components (air, water, soil, sunlight, etc.).
Q3. Define an ecosystem.
Answer: An ecosystem is a functional unit of nature where living organisms interact with one another and with the physical environment.
Q4. What are biotic components?
Answer: Biotic components are the living organisms of an ecosystem, such as plants, animals, fungi, and microorganisms.
Q5. What are abiotic components?
Answer: Abiotic components are the non-living parts of an ecosystem, such as air, water, soil, temperature, and sunlight.
Q6. What are producers?
Answer: Producers are green plants and algae that prepare their own food by photosynthesis and form the first trophic level.
Q7. Who are consumers?
Answer: Consumers are organisms that depend directly or indirectly on producers for food.
Q8. What are decomposers?
Answer: Decomposers are microorganisms such as bacteria and fungi that break down dead plants and animals into simpler substances.
Q9. What is a food chain?
Answer: A food chain is a sequence of organisms in which each organism is eaten by the next higher organism.
Q10. What is a food web?
Answer: A food web is a network of interconnected food chains in an ecosystem.
Q11. What is a trophic level?
Answer: A trophic level is each step or feeding level in a food chain.
Q12. Which organisms occupy the first trophic level?
Answer: Producers occupy the first trophic level.
Q13. Why are decomposers important in an ecosystem?
Answer: Decomposers recycle nutrients by breaking down dead organic matter and returning minerals to the soil.
Q14. State the 10% law of energy transfer.
Answer: According to the 10% law, only about 10% of the energy at one trophic level is transferred to the next trophic level.
Q15. Why are food chains generally short?
Answer: Food chains are short because most of the energy is lost at each trophic level, leaving only about 10% for the next level.
Q16. What is biological magnification?
Answer: Biological magnification is the gradual increase in the concentration of harmful non-biodegradable substances at successive trophic levels of a food chain.
Q17. Name two non-biodegradable pollutants.
Answer: DDT and plastic are examples of non-biodegradable pollutants.
Q18. What are biodegradable substances?
Answer: Biodegradable substances are materials that can be broken down by microorganisms into simpler and harmless substances.
Q19. Give two examples of biodegradable waste.
Answer: Vegetable peels and paper are examples of biodegradable waste.
Q20. What are non-biodegradable substances?
Answer: Non-biodegradable substances are materials that cannot be decomposed by microorganisms.
Q21. Give two examples of non-biodegradable waste.
Answer: Plastic and glass are examples of non-biodegradable waste.
Q22. What is ozone?
Answer: Ozone is a molecule made up of three oxygen atoms (O₃) that forms a protective layer in the stratosphere.
Q23. Why is the ozone layer important?
Answer: The ozone layer protects living organisms by absorbing harmful ultraviolet (UV) rays from the Sun.
Q24. Which chemicals are mainly responsible for ozone depletion?
Answer: Chlorofluorocarbons (CFCs) are mainly responsible for ozone depletion.
Q25. What are the harmful effects of ozone layer depletion?
Answer: Ozone depletion increases UV radiation, leading to skin cancer, cataracts, weakened immunity, and damage to plants and marine life.
Q26. What is waste management?
Answer: Waste management is the proper collection, treatment, recycling, and disposal of waste to protect the environment.
Q27. What do the 3Rs stand for?
Answer: The 3Rs stand for Reduce, Reuse, and Recycle.
Q28. Why should plastics be used judiciously?
Answer: Plastics are non-biodegradable and accumulate in the environment, causing pollution and harm to living organisms.
Q29. How can we help conserve the environment?
Answer: We can conserve the environment by planting trees, reducing waste, recycling materials, conserving natural resources, and avoiding the excessive use of plastics.
Q30. Why is environmental conservation important?
Answer: Environmental conservation is important to maintain ecological balance, protect biodiversity, conserve natural resources, and ensure a healthy planet for future generations.