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:

Related Mcqs:

1. 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%

2. Windbreaks/shelterbelts cover:

   A. Trees and / or shrubs can substantially improve the productivity of farmlands
   B. They are exposed to strong winds
   C. Both (a) & (b)
   D. None of these

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. The conifers often attain a considerable girth even upto 3m. Whilst the brich may reach _________

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

5. Pakistan Journal of Forestry published quarterly is the major organ for dissemination of research results in addition to that _____ are regularly brought out for the benefit of the field foresters and researchers:

   A. Technical notes
   B. Bulletins
   C. Research reports
   D. Brochures
   E. All of the above

6. When trees and shrubs are planted in long rows along streams, they are described as:

   A. Wind breaks
   B. Soil binders
   C. Shelter belts
   D. Basin blisters

7. A minima rotation worth the name is specified which corresponds to the age at which the trees reach the exploitable size which is usually 120 years, but is 150 years for the deodar, fir and kail in the moist zone of Kaghan 200 years for the ry zone of ______

   A. Swat
   B. Naran
   C. Kaghan
   D. None of these

8. The conifers rarely exceed 8 m. In height, the broadleaved trees reach about 9m. And the shrub growth about ______

   A. 1 to 3m
   B. 1 to 4m
   C. 1 to 5m
   D. 1 to 5m

9. Dry temperate forests are distribute throughout the inner mountain ranges beyond the effective reach of the south-west monsoon, notably in the upper reaches of the Indus and its tributaries including the whole of:

   A. Gilgit and parts of Chitral
   B. Nilam and Khaghan valleys
   C. Both (a) & (b)
   D. None of these

10. The temperatures in the Sibi plain can reach ______ in summer and drop to 1 to 3

    A. 45
    B. 50
    C. 55
    D. None of these