Which of the following prevents afforestation in deserts:

Related Mcqs:

1. Different ecological areas have different techniques for afforestation. These techniques are:

   A. Afforestation of dry tracts with irrigation
   B. Afforestation of canal banks
   C. Reclamation of dry sites without irrigation
   D. Reclamation of denuded hill slopes
   E. All of the above

2. Organization of staff and labour for afforestation means:

   A. Labour arrangements
   B. The raising and management of irrigated plantations is a highly specialized operation requiring regular trained labour
   C. Both (a) & (b)
   D. None of these

3. How CO emitted by automobiles prevents transport of O2 in the body tissues?

   A. By changing O2 into CO
   B. By destroying the haemoglobin
   C. By forming a stable compound with haemoglobin
   D. By obstructing the reaction of O2 with haemoglobin

4. Deserts plants have longer root system because:

   A. High temperature of soil encourages root growth
   B. Low temperature at night encourages root growth
   C. Those plants adapted to produce long system can survive better in desert
   D. Roots grow in search of water

5. The deserts of Pakistan is:

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

6. The Cholistan and Thar deserts comprise ______

   A. Duneland
   B. Consisting of ridges of sand
   C. Drifted and piled up by wind
   D. All of the above

7. It is estimated that ______ square km land has been converted to unproductive deserts in the last 50 years:

   A. 3.7 million
   B. 3.8 million
   C. 3.9 million
   D. 4 million

8. The Namib and the Kalahari deserts in:

   A. Southern Africa
   B. Northern Africa
   C. Both (a) & (b)
   D. None of these

9. The biggest desert belt running from the Atlantic to _______ , including Sahara and some other samaller deserts such s the Arabian Desert (Arrub-al-Khali):

   A. China
   B. India
   C. Australia
   D. Iran

10. The deserts of the world are discontinuously distributed in a pair of parallel belts lying about ______ North and South of the equator.

    A. 25
    B. 30
    C. 35
    D. 40