Class X

Which of the following is an example of herbivores?
  1. Cow
  2. Shark
  3. Lion
  4. Tiger
Which of the following is a biodegradable substance?
  1. Glass
  2. Plants
  3. Plastics
  4. Polythene
_______ is not a biodegradable pollutant.
  1. Paper
  2. Cotton Cloth
  3. Cotton
  4. DDT
The formula of Ozone is _______
  1. O3
  2. O2
  3. O4
  4. O6
The structural and functional unit of the environment is known as:
  1. ecosystem
  2. biosphere
  3. food chain
  4. food web
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