CBSE  /  Class 10  /  Science  /  Our Environment

  • 1. 
    Organisms of a higher trophic level which feed on several types of organisms belonging to a lower trophic level constitute the

  • food web
  • ecological pyramid
  • ecosystem
  • food chain

  • 2. 
    In the given Figure the various trophic levels are shown in a pyramid. At which trophic level is maximum energy available?
    MCQ Questions for Class 10 Science Chapter 15 Our Environment with Answers

  • T4
  • T2
  • T1
  • T3

  • 3. 
    Which group of organisms are not the constituents of a food chain?

  • (i) and (iii)
  • (iii) and (iv)
  • (ii) and (iii)
  • (i) and (iv)

  • 4. 
    The percentage of solar radiation absorbed by all the green plants for the process of photosynthesis is about

  • 1%
  • 5%
  • 8%
  • 10%

  • 5. 
    Which of the statements is incorrect?

  • All green plants and blue green algae are producers
  • Green plants get their food from organic compounds
  • Producers prepare their own food from inorganic compounds
  • Plants convert solar energy into chemical energy

  • 6. 
    The decomposers in an ecosystem

  • convert inorganic material, to simpler forms
  • convert organic material to inorganic forms
  • convert inorganic materials into organic compounds
  • do not breakdown organic compounds

  • 7. 
    Disposable plastic plates should not be used because

  • they are made of materials with light weight
  • they are made of toxic materials
  • they are made of biodegradable materials
  • they are made of non-biodegradable materials

  • 8. 
    What will happen if deer is missing in the food chain given below?
    Grass → Deer → Tiger

  • The population of tiger increases
  • The population of grass decreases
  • Tiger will start eating grass
  • The population of tiger decreases and the population of grass increases

  • 9. 
    When is the world environment day celebrated?

  • 16 June
  • 5 December
  • 5 June
  • 5 July

  • 10. 
    Which of these is a greenhouse gas?

  • Hydrogen sulphide
  • Methane
  • Ozone
  • Carbon monoxide
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