Plants grow sparsely in arid regions of the world:

Related Mcqs:

1. The disadvantage of ploughing in arid and semi-arid zones is:

   A. Loss of soil water
   B. Soil particles became smaller
   C. Soil organisms are exposed
   D. All of these

2. About ______ percent of the country is arid to semi-arid:

   A. 50
   B. 60
   C. 70
   D. None of these

3. In Pakistan about ________ area is arid or semi arid and agriculture is not possible without irrigation:

   A. 40%
   B. 50%
   C. 60%
   D. 70%

4. Except in the _______ most of the rangelands are located in the arid and semi-arid areas:

   A. Himalayan forest grazing areas
   B. Pothwar scrub ranges
   C. Both (a) & (b)
   D. None of these

5. In water logged soil plants cannot grow properly because the soil is:

   A. Physiologically wet
   B. Physiologically dry
   C. Physically dry
   D. None of the above

6. Endemic plants are those which grow in:

   A. Fresh water lakes
   B. Shady places
   C. Tissue of other plants
   D. Geographically limited areas

7. Plants that grow in a marshy saline habitat are called:

   A. Hydrophytes
   B. Xerophytes
   C. Mesophytes
   D. Mangroves

8. 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

9. D.G. Khan tract is typical of very arid:

   A. Sub-mountainous area
   B. Sub-tropical area
   C. Both (a) & (b)
   D. None of these

10. Those chemicals which are produced by plants and affect other plants are broadly called:

    A. Depresants
    B. Allomones
    C. Allelochemics
    D. Kairomones