A. 50%
B. 60%
C. 70%
D. 80%
Related Mcqs:
- 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 - A windbreak with 50% crown density is more effective than one of either 100% or of ______ density:
A. 15%
B. 20%
C. 25%
D. 30% - 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 - 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 - Degree of crown density in a forest stand is:
A. Closed
B. Dense
C. Thin
D. Open
E. All of the above - The characteristics of the original group system was the undulating profile of the regenerated corp obtained by reason of the considerable variation in age between the groups of regeneration:
A. Gayer’s line
B. Group system
C. Clear strip system
D. None of these - The world’s tallest cut Christmass tree was 67.36 meters (221 ft.) tall Douglas fir (Pseudosuga menziesil):
A. 67.36 meters (221 ft.)
B. 70 meters
C. 75 meters
D. None of these - 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 - Whole of the country, outside the main Himalayan Range, receives a low variable rainfall from 50 mm in western parts of Boluchistan highlands to about 1500 mm in the _____
A. Himalayan region
B. Hindu Kush region
C. Karakoram region
D. None of these - Conditions or factors which influence the crown closure is:
A. Manner of formation of the stand
B. Quality of soil
C. Soil moisture
D. All of the above
The correct answer to the question: "The best windbreaks approach is 100% crown density in the low-profile shurb, rows, and _____ density in the tall rows:" is "50% ".
