Forestry

Rill erosion

Sheet erosion

Gully erosion

All of these

Rearing of bees for honey is a very lucrative income generating industry

Well suited to the way of life of the rural population and a very useful source of much needed additional income to the farmer

Both (a) & (b)

None of these

Industrial wastes poured into water bodies

Extent to which water is polluted with organic compounds

Amount of carbon monoxide inseparably combined with haemoglobin

Amount of oxygen needed by green plants during night

Hg

Cd

Pb

Cu

The prairies of North America and the steppe of Russia and Central Asia

Grassland ecosystem support thousand of different species, above and below the ground

Both (a) & (b)

None of these

It is forestry of people by the people and for the people

The forestry in which the efforts aimed at raising and managing trees for the benefits of rural people

Both (a) & (b)

None of these

DDT

Aluminium foil

Domestic wastes

Mercury slats

These are used for a variety of purposes

They are invaluable for determining the productive capacity of forest areas

For predicting the future yield of existing crops and as an aid to thinning

All of the above

Pb, Hg, Cr, Cd

P,Mn,B,Mg

N,K,Mo

Zn,Mo,Mg,Ag

Number of trees in each size class

Passage of time from one dia class to another dia class

Casualty percentage

All of the above