The average amount of CO2 in atmosphere is:

Related Mcqs:

1. 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

2. The maximum amount of CO2 fixed by green plants by way of photosynthesis in a year is:

   A. 9 x 1013 kg
   B. 8 x 1012 kg
   C. 9 x 1011 kg
   D. 8 x 1010 kg

3. In submerged hydrophytes entry of CO2 is through:

   A. Epidermis as dissolved CO2
   B. Epidermis as carbonates only
   C. Epidermis as carbonates only
   D. Both (b) and (c)

4. It is thought that the concentration of CO2 by the year 2040 shall reach:

   A. 400 ppm
   B. 500 ppm
   C. 475 ppm
   D. 450 ppm

5. It is thought that the concentration of CO2 in the year 1890 was around:

   A. 245 ppm
   B. 275 ppm
   C. 215 ppm
   D. 230 ppm

6. Checking of re-radiating heat by atmospheric dust water vapour, ozone, CO2 is known as:

   A. Green house effect
   B. Radioactive effect
   C. Ozone layer effect
   D. Solar effect

7. The lower most layer of atmosphere in which man and other living organisms exist is called:

   A. Thermosphere
   B. Mesosphere
   C. Stratospheres
   D. Troposphere

8. The earth’s atmosphere in which organisms live, is called:

   A. Ecosystem
   B. Ectosome
   C. Biosphere
   D. Bioeconomic

9. All the living organisms on the earth interacting with atmosphere constitute:

   A. Biosphere
   B. Community
   C. Biome
   D. Association

10. The lowest temperature in the atmosphere is recorded at:

    A. Mesopause
    B. Tropopause
    C. Stratopause
    D. All of these