Sun. Sep 28th, 2025

Definition, Scope and Concepts

  1. Which of the following statements about ozone is / are true?

    Options:
    1. Ozone is a major constituent of photochemical smog
    2. Ozone is highly reactive
    3. It protects us from harmful UV radiations of sun
    4. All of the above

    Option: C

  2. Ozone day is observed on

    Options:
    1. 26th March
    2. 16th September
    3. 10th November
    4. 4th January

    Option: B

  3. Yellowing of Taj Mahal is an effect of

    Options:
    1. Acid rain
    2. Global warming
    3. Ozone depletion
    4. All of the above

    Option: A

  4. The unfavorable alteration of environment by human activities is termed as

    Options:
    1. Ecological Disturbance
    2. Ecological degradation
    3. Pollution
    4. Catastrophe

    Option: B

  5. The most important reason for decrease in Biodiversity is

    Options:
    1. Habitat pollution
    2. Over exploitation
    3. Habitat destruction
    4. Introduction of exotic species

    Option: C

  6. Energy comes from the heat inside the earth is known as

    Options:
    1. Natural gas
    2. Geothermal
    3. Petroleum
    4. Tera thermal

    Option: B

  7. The environment which has been modified by human activities is called

    Options:
    1. Natural environment
    2. Anthropogenic environment
    3. Modern environment
    4. Urban environment

    Option: B

  8. The study of interactions between living and non-living organisms and environment is called:

    Options:
    1. Ecosystem
    2. Ecology
    3. Environmental study
    4. Ecological unit

    Option: B

  9. An ecosystem consists of

    Options:
    1. Green plants and animals
    2. Green plants and decomposers
    3. Producers and consumers
    4. Green plants, animals, decomposers and abiotic environment

    Option: D

  10. Increase in fauna and decrease in flora would be harmful due to increase in

    Options:
    1. Diseases
    2. Carbon dioxide
    3. Oxygen
    4. Radioactive pollution

    Option: B

  11. What would you do to prevent environmental damage

    Options:
    1. Plant trees
    2. Halt Deforestation
    3. Control pollution
    4. All of the above

    Option: D

  12. The process of restoring forests that once existed but was removed at some time :

    Options:
    1. Afforestation
    2. Reforestation
    3. Deforestation
    4. None of these

    Option: B

  13. The discharge of warm water directly into rivers is known as

    Options:
    1. Water pollution
    2. Marine pollution
    3. Thermal pollution
    4. None of the above

    Option: C

  14. How are humans making greenhouse gases of their own?

    Options:
    1. Burning of fossil fuels
    2. Burning forests
    3. With large scale agriculture
    4. All of these

    Option: A

  15. Ozone layer is present in

    Options:
    1. Troposphere
    2. Mesosphere
    3. Thermosphere
    4. Stratosphere

    Option: D

  16. The salient features of the environment is / are :

    Options:
    1. It is the sum of biotic and abiotic elements.
    2. It is based on the interactive and functional relationship between biotic and abiotic
    3. It always tends to maintain ecological balance.
    4. All of the above

    Option: D

  17. Which layer of the earth is also called Ozonosphere :

    Options:
    1. Stratosphere
    2. Troposphere
    3. Thermosphere
    4. Mesosphere

    Option: A

  18. What is the percentage of oxygen and carbon dioxide existing in the ecosystem

    Options:
    1. 20.95% and 0.003%
    2. 20.95% and 0.03%
    3. 20.0% and 0.40 %
    4. 20.0% and 0.44 %

    Option: B

  19. Process of evapo transpiration and precipitation is called:

    Options:
    1. Carbon cycle
    2. Nitrogen cycle
    3. Hydrological cycle
    4. All of the above

    Option: C

  20. Earth is an

    Options:
    1. Open system
    2. Closed system
    3. Both open and closed system
    4. Neither a nor b

    Option: C