Deserts plants have longer root system because:

Related Mcqs:

1. Xerophytes have longer root system:

   A. To grant mechanical support
   B. Due to light factor
   C. To draw water from deeper zones
   D. None of the above

2. A bacterium found in the root nodules of leguminous plants is the:

   A. Clostridium
   B. Azotobacter
   C. Nitrobacter
   D. Rhizobium

3. The deserts of Pakistan is:

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

4. 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

5. Which of the following prevents afforestation in deserts:

   A. Goat and grazing animals
   B. Local resident
   C. Unfertility of soil
   D. Low rainfall

6. A country where _____ per cent of the total aea consists of moutains, gullied foot hills, arid waste and deserts, can never achieve the desired progress unless major part of this usable waste is harnessed to the advantage of its people:

   A. 50 to 55
   B. 55 to 60
   C. 65 to 70
   D. None of these

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