Available Answers

1. 1.

   Multiple choice questions.

   1. The environment consisting of living components is called:
      1. nonliving environment
      2. abiotic environment
      3. biotic environment
      4. ecology
   2. The portion of the earth on which the biotic components of our environment are present is called:
      1. hydrosphere
      2. lithosphere
      3. atmosphere
      4. biosphere
   3. The branch of science which deals with the study of ecosystem is called:
      1. ethology
      2. ecology
      3. anthology
      4. phycology
   4. Which of the following methods of waste disposal involves burning organic wastes in special furnaces?
      1. Incineration
      2. Landfill
      3. Composting
      4. Bio-gas
   5. Which of the following is not a green house gas?
      1. Methane
      2. Oxygen
      3. Nitrous oxide
      4. Carbon dioxide
   6. Taj Mahal is losing its lustre and turning pale yellow due to:
      1. ozone layer depletion
      2. global warming
      3. acid rain
      4. hazardous waste
   7. The waste that cannot be decomposed properly is called:
      1. biodegradable waste
      2. hazardous waste
      3. recyclable waste
      4. non-biodegradable waste
2. 2.

   Fill in the Blanks.

   bad, population, oikos, biosphere, nitrogen, sulphur

   1. Ecology is derived from the Greek words _____________ meaning home.
   2. _____________ is the portion of the earth on which the biotic components of our environment are present.
   3. Domestic as well as industrial wastes have increased due to the increase in _____________.
   4. The landfill is covered by soil to prevent _____________ smell.
   5. Acid rain is mainly caused by the release of oxides of _____________ and _____________.
3. 3.

   How does global warming affect the earth?

4. 4.

   What do you understand by incineration of wastes?

5. 5.

   What is recycling?

6. 6.

   What do you understand by the term 'green house effect'?