Forestry

Pollutants in air

Use of detergents

Water pollution

Depletion of O3 layer

Inorganic phosphates are lost by leaching

Ocean phosphates are lost by sedimentation

Soluble phosphates are lost by erosion

Soil has plenty of dissolved phosphates

Use of forest resource at a constant level which it can sustain in perpetuity at a given intensity of management

Continuous supply of products from forests in existing stage

To facilitate organization and administration

All of the above

Heavy frost

Heavy low temperature

Both (a) & (b)

None of these

An open rather low forest composed

A few trees of the thorn forest type

With a predominantly deciduous shrub layer

All of the above

150

1,500

300

3,000

A large evergreen shrub

Leaves in whorls, elliptic-oblong or oblong-obovate

Both (a) & (b)

None of these

Face to face communication with individuals

Group or a whole community has long been practiced in the rural society of Pakistan

Both (a) & (b)

None of these

Thal

Cholistan

Thar

All of the above

In lakes and streams

In rivers

Underground

On polar ice and glaciers