Forestry

Variation of volume increment with age is:

A. Current annual increment (CAI)
B. Mean annual increment (MAI)
C. Both (a) & (b)
D. None of these

What is increment?

A. The increase in girth, diameter, basal area, height, volume, quality

B. Value of individual tree or crops during a given period

C. Utilizable portions of total woody growth goes on increasing

D. 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 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

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

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

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

The major types of methods of thinnings is:

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: