Class 10 Science Chapter 13 our environment Archives - VSJ BEAWAR https://notesjobs.in/tag/class-10-science-chapter-13-our-environment/ A Way Towards Success Sun, 11 May 2025 12:14:41 +0000 en-US hourly 1 https://wordpress.org/?v=7.1 https://notesjobs.in/wp-content/uploads/2023/03/cropped-cropped-site-logo-32x32.jpg Class 10 Science Chapter 13 our environment Archives - VSJ BEAWAR https://notesjobs.in/tag/class-10-science-chapter-13-our-environment/ 32 32 Class 10 Science Chapter 13 Our Environment https://notesjobs.in/class-10-science-chapter-13-our-environment-2/ Sat, 08 Feb 2025 09:11:57 +0000 https://notesinhindi.online/?p=2867 Class 10 Science Chapter 13 Our Environment 1. What is an ecosystem composed of? (A) Only plants and animals (B) Only physical surroundings (C) Both biotic and abiotic components (D) Only microorganisms Answer Answer: (C) Both biotic and abiotic components 2. Which of the following is an example of a human-made ecosystem? (A) Forest (B) ... Read more

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1. What is an ecosystem composed of?
  • (A) Only plants and animals
  • (B) Only physical surroundings
  • (C) Both biotic and abiotic components
  • (D) Only microorganisms
    • Answer

    Answer: (C) Both biotic and abiotic components

     2. Which of the following is an example of a human-made ecosystem?
  • (A) Forest
  • (B) Pond
  • (C) Aquarium
  • (D) Lake
    • Answer

    Answer: (C) Aquarium

     3. Which organisms are known as producers in an ecosystem?
  • (A) Herbivores
  • (B) Carnivores
  • (C) Green plants and certain bacteria
  • (D) Decomposers
    • Answer

    Answer: (C) Green plants and certain bacteria

     4. Which of the following is NOT a component of an ecosystem?
  • (A) Temperature
  • (B) Soil
  • (C) Sunlight
  • (D) None of the above
    • Answer

    Answer: (D) None of the above

     5. What role do decomposers play in an ecosystem?
  • (A) They produce food
  • (B) They break down dead organisms and recycle nutrients
  • (C) They consume primary producers
  • (D) They provide shelter for herbivores
    • Answer

    Answer: (B) They break down dead organisms and recycle nutrients

     6. What is the primary function of producers in an ecosystem?
  • (A) Breaking down organic matter
  • (B) Converting solar energy into chemical energy
  • (C) Consuming other organisms
  • (D) Providing oxygen to decomposers
    • Answer

    Answer: (B) Converting solar energy into chemical energy

     7. Which of the following is an example of a natural ecosystem?
  • (A) Garden
  • (B) Crop-field
  • (C) Pond
  • (D) Aquarium
    • Answer

    Answer: (C) Pond

     8. Which organisms are responsible for decomposing dead organic matter?
  • (A) Producers
  • (B) Consumers
  • (C) Decomposers
  • (D) Herbivores
    • Answer

    Answer: (C) Decomposers

     9. What type of ecosystem is a garden?
  • (A) Natural ecosystem
  • (B) Artificial ecosystem
  • (C) Marine ecosystem
  • (D) Grassland ecosystem
    • Answer

    Answer: (B) Artificial ecosystem

     10. Why do we need to clean an aquarium regularly?
  • (A) Because it lacks natural decomposers
  • (B) Because fish do not produce waste
  • (C) Because plants absorb all nutrients
  • (D) Because water is constantly replaced
    • Answer

    Answer: (A) Because it lacks natural decomposers

     11. Which of the following is the first trophic level in a food chain?
  • (A) Primary consumers
  • (B) Producers
  • (C) Secondary consumers
  • (D) Tertiary consumers
    • Answer

    Answer: (B) Producers

     12. What percentage of solar energy is captured by green plants in a terrestrial ecosystem?
  • (A) 10%
  • (B) 5%
  • (C) 1%
  • (D) 20%
    • Answer

    Answer: (C) 1%

     13. Why do food chains generally have only three to four steps?
  • (A) Energy is lost at each trophic level
  • (B) Higher-level consumers cannot digest plants
  • (C) Decomposers break down all organisms
  • (D) Only herbivores exist in nature
    • Answer

    Answer: (A) Energy is lost at each trophic level

     14. What happens to the energy that is not transferred to the next trophic level?
  • (A) It is converted into minerals
  • (B) It is recycled back to producers
  • (C) It is lost as heat
  • (D) It is absorbed by decomposers
    • Answer

    Answer: (C) It is lost as heat

     15. Which of the following correctly represents the flow of energy in a food chain?
  • (A) Producers → Primary consumers → Secondary consumers → Tertiary consumers
  • (B) Tertiary consumers → Secondary consumers → Primary consumers → Producers
  • (C) Consumers → Decomposers → Producers
  • (D) Producers → Decomposers → Consumers
    • Answer

    Answer: (A) Producers → Primary consumers → Secondary consumers → Tertiary consumers

     16. What is the role of decomposers in an ecosystem?
  • (A) They convert solar energy into food
  • (B) They break down organic matter into simpler substances
  • (C) They consume herbivores
  • (D) They prevent energy loss in food chains
    • Answer

    Answer: (B) They break down organic matter into simpler substances

     17. Which of the following statements about energy flow in an ecosystem is correct?
  • (A) Energy flows in a circular path
  • (B) Energy flow is unidirectional
  • (C) Energy returns to autotrophs after being used by consumers
  • (D) Energy at higher trophic levels is greater than at lower levels
    • Answer

    Answer: (B) Energy flow is unidirectional

     18. What percentage of energy is typically transferred from one trophic level to the next?
  • (A) 50%
  • (B) 25%
  • (C) 10%
  • (D) 1%
    • Answer

    Answer: (C) 10%

     19. Why are there usually more producers than consumers in an ecosystem?
  • (A) Because producers need more energy
  • (B) Because energy is lost at each trophic level
  • (C) Because consumers reproduce more slowly
  • (D) Because decomposers rely on producers
    • Answer

    Answer: (B) Because energy is lost at each trophic level

     20. Which of the following best describes a food web?
  • (A) A straight-line sequence of who eats whom
  • (B) A simple relationship between producers and consumers
  • (C) A complex network of interconnected food chains
  • (D) A cycle where energy returns to the Sun
    • Answer

    Answer: (C) A complex network of interconnected food chains

     21. Why is energy flow in an ecosystem considered unidirectional?
  • (A) Because energy returns to the Sun
  • (B) Because energy lost as heat cannot be reused
  • (C) Because decomposers recycle energy to producers
  • (D) Because energy is stored indefinitely at each trophic level
    • Answer

    Answer: (B) Because energy lost as heat cannot be reused

     22. What happens to harmful chemicals like pesticides as they move up the food chain?
  • (A) They become less concentrated
  • (B) They disappear completely
  • (C) They accumulate in higher concentrations
  • (D) They get converted into useful nutrients
    • Answer

    Answer: (C) They accumulate in higher concentrations

     23. What is the process of accumulation of harmful chemicals at higher trophic levels called?
  • (A) Eutrophication
  • (B) Biological Magnification
  • (C) Photosynthesis
  • (D) Decomposition
    • Answer

    Answer: (B) Biological Magnification

     24. Why do humans have the highest concentration of toxic substances in the food chain?
  • (A) Because humans consume food from multiple trophic levels
  • (B) Because humans are primary producers
  • (C) Because humans do not excrete toxins
  • (D) Because humans only consume decomposers
    • Answer

    Answer: (A) Because humans consume food from multiple trophic levels

     25. Which of the following is a consequence of biological magnification?
  • (A) Increased energy availability at higher trophic levels
  • (B) Increased population of producers
  • (C) Harmful effects on top consumers like humans
  • (D) Reduction of carbon dioxide in the atmosphere
    • Answer

    Answer: (C) Harmful effects on top consumers like humans

     26. What is the main function of the ozone layer in Earth’s atmosphere?
  • (A) To provide oxygen to living organisms
  • (B) To block harmful ultraviolet (UV) radiation
  • (C) To trap greenhouse gases
  • (D) To regulate Earth’s temperature
    • Answer

    Answer: (B) To block harmful ultraviolet (UV) radiation

     27. Which harmful chemicals are responsible for the depletion of the ozone layer?
  • (A) Carbon dioxide and methane
  • (B) Sulfur dioxide and nitrogen oxides
  • (C) Chlorofluorocarbons (CFCs)
  • (D) Hydrocarbons and lead compounds
    • Answer

    Answer: (C) Chlorofluorocarbons (CFCs)

     28. What harmful effect does UV radiation have on humans?
  • (A) Increases oxygen levels
  • (B) Causes skin cancer and cataracts
  • (C) Reduces body temperature
  • (D) Improves immune function
    • Answer

    Answer: (B) Causes skin cancer and cataracts

     29. What was the international agreement signed to reduce CFC production?
  • (A) Kyoto Protocol
  • (B) Paris Agreement
  • (C) Montreal Protocol
  • (D) Rio Summit
    • Answer

    Answer: (C) Montreal Protocol

     30. How does ozone depletion affect the environment?
  • (A) Increases agricultural productivity
  • (B) Leads to global cooling
  • (C) Harms aquatic ecosystems and disrupts food chains
  • (D) Reduces greenhouse gases
    • Answer

    Answer: (C) Harms aquatic ecosystems and disrupts food chains

     31. What is the primary cause of ozone layer depletion?
  • (A) Increase in carbon dioxide emissions
  • (B) Excessive use of plastic
  • (C) Release of chlorofluorocarbons (CFCs)
  • (D) Deforestation
    • Answer

    Answer: (C) Release of chlorofluorocarbons (CFCs)

     32. Which international body took action to control CFC emissions?
  • (A) World Health Organization (WHO)
  • (B) United Nations Environment Programme (UNEP)
  • (C) World Trade Organization (WTO)
  • (D) International Monetary Fund (IMF)
    • Answer

    Answer: (B) United Nations Environment Programme (UNEP)

     33. Why is ozone depletion a global concern?
  • (A) It reduces the amount of oxygen available
  • (B) It increases the amount of greenhouse gases
  • (C) It allows more UV radiation to reach Earth’s surface
  • (D) It causes acid rain
    • Answer

    Answer: (C) It allows more UV radiation to reach Earth’s surface

     34. Which of the following human activities does NOT contribute to ozone depletion?
  • (A) Use of air conditioners and refrigerators with CFCs
  • (B) Industrial emissions containing CFCs
  • (C) Burning fossil fuels
  • (D) Using aerosol sprays with CFCs
    • Answer

    Answer: (C) Burning fossil fuels

     35. What was the primary goal of the Montreal Protocol?
  • (A) To reduce carbon dioxide emissions
  • (B) To phase out the production of ozone-depleting substances
  • (C) To promote reforestation
  • (D) To increase renewable energy use
    • Answer

    Answer: (B) To phase out the production of ozone-depleting substances

     36. What is the primary reason for managing waste disposal effectively?
  • (A) To increase landfill sites
  • (B) To reduce environmental pollution
  • (C) To encourage plastic use
  • (D) To increase waste production
    • Answer

    Answer: (B) To reduce environmental pollution

     37. Which of the following materials is biodegradable?
  • (A) Plastic
  • (B) Glass
  • (C) Paper
  • (D) Metal
    • Answer

    Answer: (C) Paper

     38. What is the main problem caused by non-biodegradable waste?
  • (A) It decomposes too quickly
  • (B) It harms ecosystems and accumulates in the environment
  • (C) It provides nutrients to the soil
  • (D) It improves air quality
    • Answer

    Answer: (B) It harms ecosystems and accumulates in the environment

     39. Which of the following is an environment-friendly waste management practice?
  • (A) Burning plastic waste
  • (B) Dumping waste in rivers
  • (C) Recycling and composting
  • (D) Throwing garbage on roads
    • Answer

    Answer: (C) Recycling and composting

     40. Why are plastics considered harmful to the environment?
  • (A) They decompose easily
  • (B) They are biodegradable
  • (C) They persist in the environment for a long time
  • (D) They improve soil fertility
    • Answer

    Answer: (C) They persist in the environment for a long time

     41. What is the main reason for the accumulation of non-biodegradable waste in the environment?
  • (A) It decomposes quickly
  • (B) It cannot be broken down by natural processes
  • (C) It improves soil fertility
  • (D) It is consumed by decomposers
    • Answer

    Answer: (B) It cannot be broken down by natural processes

     42. Which of the following is an example of non-biodegradable waste?
  • (A) Vegetable peels
  • (B) Paper
  • (C) Plastic bags
  • (D) Fruit peels
    • Answer

    Answer: (C) Plastic bags

     43. Why is improper waste disposal a serious environmental concern?
  • (A) It leads to land, air, and water pollution
  • (B) It improves the quality of soil
  • (C) It increases oxygen levels in the atmosphere
  • (D) It helps in the natural decomposition process
    • Answer

    Answer: (A) It leads to land, air, and water pollution

     44. Which of the following methods can help reduce non-biodegradable waste?
  • (A) Using plastic bags
  • (B) Burning plastic in open areas
  • (C) Recycling and reusing materials
  • (D) Dumping waste in rivers
    • Answer

    Answer: (C) Recycling and reusing materials

     45. Why is it important to separate biodegradable and non-biodegradable waste?
  • (A) To make waste collection more difficult
  • (B) To ensure that all waste is dumped together
  • (C) To facilitate proper waste management and recycling
  • (D) To reduce the amount of biodegradable waste
    • Answer

    Answer: (C) To facilitate proper waste management and recycling

     46. What is the primary cause of ozone depletion?
  • (A) Excessive use of fossil fuels
  • (B) Release of chlorofluorocarbons (CFCs)
  • (C) Deforestation
  • (D) Industrial waste dumping
    • Answer

    Answer: (B) Release of chlorofluorocarbons (CFCs)

     47. Which of the following is an example of a biodegradable waste material?
  • (A) Plastic bottles
  • (B) Glass containers
  • (C) Vegetable peels
  • (D) Metal cans
    • Answer

    Answer: (C) Vegetable peels

     48. What is the impact of excessive non-biodegradable waste on the environment?
  • (A) It helps in soil fertility
  • (B) It remains in the environment for a long time and causes pollution
  • (C) It decomposes quickly
  • (D) It increases oxygen levels
    • Answer

    Answer: (B) It remains in the environment for a long time and causes pollution

     49. What is an effective way to manage biodegradable waste?
  • (A) Burning it in open fields
  • (B) Dumping it into rivers
  • (C) Composting it for organic manure
  • (D) Throwing it in plastic bags
    • Answer

    Answer: (C) Composting it for organic manure

     50. Why is it necessary to reduce the use of plastics?
  • (A) Because plastics decompose quickly
  • (B) Because plastics are biodegradable
  • (C) Because plastics persist in the environment and cause pollution
  • (D) Because plastics help in soil conservation
    • Answer

    Answer: (C) Because plastics persist in the environment and cause pollution

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