The atmospheric UV radiations are absorbed in the zone called:

Related Mcqs:

1. 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

2. The most harmful effect of ionising radiations precisely involves:

   A. Cell membranes
   B. DNA
   C. Mitochondria and ribosomes
   D. Nucleus

3. The ultraviolet radiations from the sun cause reaction that produce:

   A. Carbon monoxide
   B. Sulphur dioxide
   C. Ozone
   D. Flourides

4. The solar radiations are the sole source of:

   A. Energy
   B. Materials
   C. Both (a) & (b)
   D. Standing state

5. The ultraviolet radiations are able to peretreate in a sea as deep as:

   A. 40 meters
   B. 400 meters
   C. 200 meters
   D. 5 meters

6. According to Odum the light absorbed by the plant cover in terms of kcal/m2/day is:

   A. 150
   B. 1,500
   C. 300
   D. 3,000

7. The ecosystem lying in the alpine zone between taiga and polar ice is called:

   A. Savana
   B. Autotrophic
   C. Heterotrophic
   D. Tundra

8. The zone of soil showing microbial activity around the roots of higher plants is called:

   A. Rhizosphere
   B. Rhizoplane
   C. Soil microflora
   D. All of these

9. The transition zone between two different types of communities is called:

   A. Biome
   B. Ecotone
   C. Biological spectrum
   D. Biological clock

10. Which of the following is not an important atmospheric pollutant?

    A. CO
    B. SO2
    C. CO2
    D. Hydrocarbons