Which one of the following elements is the critical limiting factors in the function of ecosphere because of its irretrievable loss in the ocear:

Related Mcqs:

1. Hazards include all those factors that can injure or kill an animal (natural factors)

   A. Fire, rain and wind as well as man made structures such as roads and fences
   B. Thus challenging an animal’s physiological capacity as to prevent it from reproducing successfully
   C. Both (a) & (b)
   D. None of these

2. The cycling of elements in an ecosystem is called:

   A. Chemical cycle
   B. Biogeochemical cycle
   C. Geological cycle
   D. Geochemical cycle

3. The back and forth movements of chemical elements, between organisms and environment along characteristic circular paths and known as:

   A. Biochemical cycles
   B. Ecological cycles
   C. Chemical cycles
   D. None of these

4. Main elements of the policy relation to land use:

   A. Hill forests
   B. Watersheds
   C. Rangelands
   D. Wildlife areas
   E. All of the above

5. Which one of the following factors is biotic?

   A. Photoperiod
   B. CO2 content to the soil
   C. Texture and porosity of soil
   D. Rainfall

6. The causes of loss of biological diversity are:

   A. Over hunting is perhaps the most obvious direct cause of extinction in animals, as it has affected several large and well-known species
   B. Genetic diversity as represented by genetic differences between discrete populations with wild species, is liable to reduction as result of the same factors affecting species
   C. A major, though at present largely unpredictable, change in natural environments is likely to occur within the next century as a result of large-scale changes in global climate and weather patterns
   D. All of the above

7. At which latitude, heat grain through insolation approximately equals heat loss through terrestrial radiation?

   A. 42 1/2? North and South
   B. 22 1/2? North and South
   C. 60? North and South
   D. 40? North and South

8. Removal of top soil by soil erosion result in the loss of soil:

   A. Nitrites
   B. Nitrates
   C. Nitrogen
   D. Nitric and nitrous acids

9. The sedimentation in the most vital reservoirs of the country, the nation is losing some US $130.8 million every year due to loss of:

   A. Fertile soil, shrinkage of storage capacity
   B. Reduction agricultural products, power generation and industrial output
   C. Both (a) & (b)
   D. None of these

10. Loss of forests, urbanization, increasing pollution are all due to:

    A. Population explosion
    B. Nitrogen di-oxide
    C. Global warming
    D. Sulphur dioxide