Class 10 Our Environment CBSE Questions & Answers

Class 10 · Our Environment

Class 10 Our Environment CBSE Questions & Answers. There are 15 questions in this test with each question having around four answer choices.

Questions & Answers

1
The driving force of an ecosystem is-
  • A
    Producers
  • B
    Biomass
  • C
    Carbohydrates in plants
  • D
    Solar energy.
    Correct
2
A food chain always starts with-
  • A
    Photosynthesis
    Correct
  • B
    Decomposition
  • C
    Nitrogen fixation.
  • D
    Respiration
3
According to \({\rm{1}}0\% \) law, the energy available to each successive level is _________ of previous level
  • A
    \({\rm{1}}0\% \)
    Correct
  • B
    None
  • C
    \({\rm{1}}00\% \)
  • D
    \({\rm{1}}\% \)
4
A biotic components of ecosystem are-
  • A
    Inorganic substances and climatic factors both
    Correct
  • B
    climatic factors
  • C
    Inorganic substances
  • D
    decomposers
5
The decomposers in an ecosystem-
  • A
    Convert inorganic materials into organic compounds.
  • B
    Convert inorganic material to simples forms.
  • C
    Do not breakdown organic compounds.
  • D
    Convert organic material to inorganic forms.
    Correct
6
In due given food chain, suppose the amount of energy available at third trophic level is 50 KJ, what will be the energy available at due producer level?
  • A
    5 KJ
  • B
    5000KJ
    Correct
  • C
    50 KJ
  • D
    500KJ
7
In the following groups of materials, which group’s contain only non-biodegradable.
  • A
    Polythene, detergent, PVC
    Correct
  • B
    Plastic, Bakelite, DDT
  • C
    Wood, paper leather
  • D
    Plastic, detergent, grass
8
An example of man-made ecosystem is -
  • A
    River
  • B
    Garden
    Correct
  • C
    Desert
  • D
    Grassland.
9
A food chain consist of
  • A
    Producers, consumers and decomposers.
  • B
    Producers, carnivores and decomposers.
  • C
    Producers, herbivores and carnivores.
    Correct
  • D
    Producers and primary consumers
10
The process of eating and being eaten is called-
  • A
    Food store
  • B
    Food chain
  • C
    Food cycle
  • D
    Food web
    Correct
11
The relationship between biotic and biotic environment is called-
  • A
    Biosphere
  • B
    Ecosystem.
    Correct
  • C
    Biome
  • D
    Community
12
Advantage of cloth bags over plastic bags is-
  • A
    They are biodegradable.
    Correct
  • B
    They are cheap and they are biodegradable
  • C
    They are cheap
  • D
    None of the above.
13
Steps of a food chain are called-
  • A
    Food steps
  • B
    Food levels.
  • C
    Trophic steps
  • D
    Trophic levels.
    Correct
14
The percentage of solar radiation absorbed by all the green plants for the process of photosynthesis is about-
  • A
    \({\rm{1}}0\% \)
  • B
    \({\rm{1}}\% \)
    Correct
  • C
    \({\rm{5}}\% \)
  • D
    \({\rm{8}}\% \)
15
Which of the following limits the number of trophic levels in a food chain-
  • A
    Water
  • B
    Food supply
  • C
    Polluted air
  • D
    Decrease in energy at each trophic level.
    Correct