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

Related Mcqs:

1. 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

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. 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. 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

5. 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)

6. The average amount of CO2 in atmosphere is:

   A. 0.30%
   B. 0.00%
   C. 3.00%
   D. 0.03%

7. A minima rotation worth the name is specified which corresponds to the age at which the trees reach the exploitable size which is usually 120 years, but is 150 years for the deodar, fir and kail in the moist zone of Kaghan 200 years for the ry zone of ______

   A. Swat
   B. Naran
   C. Kaghan
   D. None of these

8. Dry temperate forests are distribute throughout the inner mountain ranges beyond the effective reach of the south-west monsoon, notably in the upper reaches of the Indus and its tributaries including the whole of:

   A. Gilgit and parts of Chitral
   B. Nilam and Khaghan valleys
   C. Both (a) & (b)
   D. None of these

9. The desert rangelands of ______ are within the reach of monsoon rainfall:

   A. Thal
   B. Cholistan
   C. Thar
   D. All of the above

10. The temperatures in the Sibi plain can reach ______ in summer and drop to 1 to 3

    A. 45
    B. 50
    C. 55
    D. None of these