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CSS :: Tending Of Forest Crops


31.  Dead and Moribund trees (m) include:
A. Bent over B. Badly leaning trees usually of the whip type
C. Both (a) & (b) D. None of these

32.  Diseased trees (k) including those which are infected with parasites to such an extent that their growth is seriously affected or that they are a danger to their neighbours:
A. Dominant B. Dominated and suppressed
C. Both (a) & (b) D. None of these

33.  The major types of methods of thinnings is:
A. Low thinning or ordinary thinning B. Crown thinnings or high thinning
C. Selection thinning D. Mechanical thinning
E. All of the above    

34.  Low thinning or ordinary thinning is:
A. Trees are removed from the lower crown classes B. In the lighest grade of low thinnings only the suppressed trees would be removed
C. Both (a) & (b) D. None of these

35.  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    

36.  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 calsses
C. Both (a) & (b) D. None of these

37.  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

38.  The classes of trees are removed in selection thinning:
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

39.  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

40.  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




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