A. They are restricting the development of their neighbours on all sides
B. They are less valuable than their neighbours
C. They are of no special importance with regard to desirable species mixture
D. All of the above
Related Mcqs:
- Crown thinning or high thinning is:
A. Trees are removed from the upper crown classes in order to open up the canopy
B. It favour the development of the most promising trees of the same classes
C. Both (a) & (b)
D. None of these - Low thinning or ordinary thinning is:
A. Trees are removed from the lower crown classes
B. In the highest grade of low thinnings only the suppressed trees would be removed
C. Both (a) & (b)
D. None of these - Selection thinning is:
A. In principle from the two methods already discussed
B. The dominant trees are removed in order to stimulate the growth of the trees of the lower crown classes
C. The same kind of vigorous trees those are favoured in crown
D. All of the above - Common combinations of the agroforestry system in Pakistan are: Trees species: Agricultural crops grown with trees:
A. Poplars: wheat / maize / turmeric / sugarcane / vegetables / fodder
B. Eucalypts: wheat/sunflower/tomatoes/potatoes/chilies
C. Simal: maize/sunflower/vegetables/fodder
D. Shisham: turmeric/wheat/maize/vegetables
E. All of the above - Free thinning is:
A. The attention is concentrated still further on the selection of the stems evenly spaced over the ground
B. Which are to be retained to maturity or till the last thinning or two
C. Both (a) & (b)
D. None of these - Mechanical thinning is:
A. The trees to be cut or retained are chosen on the basis of a predetermined spacing
B. Or pattern with little or no regard for their position in the crown canopy
C. Both (a) & (b)
D. None of these - The standard grades of ordinary thinning is:
A. Light Thinning (A-Grade)
B. Moderate Thinning (B-Grade)
C. Heavy Thinning (C-Grade)
D. Very Heavy Thinning (D-Grade)
E. All of the above - The fundamental objectives of thinning are:
A. To redistribute the growth potential of the stand to optimum advantage
B. To utilize all the merchantable material produced by the stand during the rotation
C. Both (a) & (b)
D. None of these - Effecting/effects of thinning are:
A. Average tree size in the remaining crop increases with increasing weight of thinning
B. Delay in thinning is not compensated for in terms of girth increment by removing larger volume, unless this volume represents a greater proportion of the growing stock than did the earlier thinning
C. Both (a) & (b)
D. None of these - Thinning in mixed plantations are:
A. It is hardly impossible that mixed plant have same height
B. Ordinary thinning is not applied as it deprives of slow growing spp.
C. Both (a) & (b)
D. None of these
The correct answer to the question: "The classes of trees are removed in selection thinning:" is "All of the above".
