Forestry

The contrary, properly conducted pruning is not harmful to the tree

Careless pruning can, however, cause injury to the bole, leaving wounds extending through the bark into the cambium and even to the wood

Both (a) & (b)

None of these

Upper layers of soil are loosened and are eroded

Lower layers are made more compact and root respiration is interfered with

Lower compact layers make root penetration difficult

All of the above

Acid rain

Smog

Both (a) & (b)

None of these

The watershed areas are surviving just on subsistence level due to limited resource gradually getting

Further improverished on account of over-grazing, removal of vegetation, and cultivation on steep scopes

Both (a) & (b)

None of these

12.2

13.2

14.2

15.2

Hazards, Diseases,

Predators, Genetics (species characteristics)

Resources, Human

All of the above

Herbivores

Carnivores

Planktons

Fauna and flora

Diatoms

Najas

Zanichellia

Lemna

It is a Land body which drains into a stream system

Its an other name of catchment watershed

Both (a) & (b)

None of these

The natural geo-chemical cycles

The natural balance of our environment

The natural flora of a place

The natural wildlife of a region