The part of earth in which life exists is known as:

Related Mcqs:

1. The part of earth in which life exists is known as:

   A. Lithosphere
   B. Biosphere
   C. Atmosphere
   D. Hydrosphere

2. The term biosphere is used for the zone of earth where life exists:

   A. On the lithosphere surface
   B. In the hydrosphere
   C. In the lithosphere, hydrosphere and atmosphere
   D. In the lithosphere and hydrosphere

3. If there were no CO2 in the earth’s atmosphere, the temperature of earth’s surface would have been:

   A. same as present
   B. Less than the present
   C. Higher than the present
   D. Dependent on the amount of O2 in the atmosphere

4. Geology is the study of earth. Earth’s crust is divided into:

   A. Ocean
   B. Continents
   C. Both (a) & (b)
   D. None of these

5. The ecosystem exists in a state of ‘balance’. Supposing one of the heterotrophs, says the rabbit, multiplies and increases in number suddenly then:

   A. The balance will be permanently upset because the rabbits will eat the grass in the system and die of starvation
   B. The ‘balance’ will be restored by an increase in the wolf population
   C. Epidemics will break out in the rabbits and kill all of them
   D. Rabbits will starts eating each other

6. The ‘Earth summit’ was held at:

   A. Geneva
   B. Islamabad
   C. Sydney
   D. Rio-de-Janeiro

7. What immediate hazard is likely to occur if the temperature of the earth rises by 5?C?

   A. Melting of polar ice
   B. Destruction of phytoplanktons
   C. Inundation of coastal towns
   D. Increase in productivity

8. The presence of O3 in atmosphere of earth:

   A. Has been responsible for increasing the average global temperature in recent
   B. Is advantageous since it supplies O2 for people travelling in jets
   C. Hinders higher rate of photosynthesis
   D. Helps in checking the penetration of ultra violet rays to earth

9. Most outstanding danger at present for the survival of living beings on earth is:

   A. Radiation hazard
   B. Desertification
   C. Deforestation
   D. Gleization

10. Heating of earth surface is due to:

    A. Air pollution
    B. Water pollution
    C. Soil pollution
    D. All of these