Windbreaks/shelterbelts cover:

Related Mcqs:

1. In Pakistan, because of small field size, most often 2 or 3 rows windbreaks are used, and should expect the effects to reach only about 12H downwind and _____ upwind:

   A. 1H
   B. 2H
   C. 3H
   D. 4H

2. The best windbreaks approach is 100% crown density in the low-profile shurb, rows, and _____ density in the tall rows:

   A. 50%
   B. 60%
   C. 70%
   D. 80%

3. How windbreaks functions is:

   A. The air is baffled and mixed as it hits the wind breaks
   B. Causing a disruptive turbulence patterns which spoils the energy and velocity of the wind
   C. This mixing and churning continues as the pressure gradient is built by the windbreak and the air leaks through or rolls over the top of the screen
   D. All of the above

4. 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

5. The terms used for various programmes of extending tree cover to non-forestry areas, used rather loosely in Indo-Pak subcontinent are:

   A. Social forestry, farm forestry, agroforestry
   B. Community forestry, environmental forestry, tree farming
   C. Forest farming, village woodlots, small-scale forestry
   D. All of the above

6. The conifers generally form a fairly complete forest cover of good height is:

   A. 22 to 44 m
   B. 24 to 46 m
   C. 26 to 48 m
   D. 28 to 50 m

7. Cover crops is:

   A. Crops of subsidiary species, (usually low shrubs but on occasion small trees or even herbs)
   B. Intentionally introduced into a plantation with the primary object of restoring a cover to the soil as quickly as possible
   C. It minimizing the known deterioration consequent on exposure
   D. All of the above

8. Fragile ecosystems cover:

   A. The arid and semi-arid zones of the world, arid savannas of the tropics, the slopes of the mountains of the tropics
   B. And subtropics and forest areas of the developing world under shifting cultivation have been described as ‘Fragile Ecosystems’
   C. Because their equilibrium appears to be easily upset and because they become ecologically degraded if certain forms of land use
   D. All of the above

9. Kohistan ranges cover about ________ million ha.

   A. 2.3 million
   B. 2.4 million
   C. 2.5 million
   D. 2.6 million

10. Himalayan forest grazing lands cover:

    A. Siran
    B. Kaghan
    C. Neelam
    D. Jhelum
    E. All of the above