Forestry

Arsine

SO2

NH3

N2O

General considerations

Species for dry zone reclamation

Site preparation

None of these

Secondary productivity

Tertiary productivity

Both (a) & (b)

Net productivity

The name given to the first report of changes in the amount of ozone

The upper layers of the atmosphere over the south pole

Both (a) & (b)

None of these

Closely related species occupying the same niche

Closely related species occupying different niche

Unrelated species occupying the same niche

Species occupying different overlapping ecosystems

Epilimnion

Metalimnion

Hypolimnion

All of the above

Nitrogen fixing organisms

Photosynthesizing organisms

Respiration

Decomposers

Home range, breeding season

Longevity, territory and the niche

Both (a) & (b)

None of these

34.73 million ha.

46.50 million ha.

56.80 million ha.

None of these

Suppression of weeds, by restricting the amount of light on the ground surface and thus hindering their germination and growth

Conservation of soil, by preventing erosion

Maintenance or improvement of soil structure, by eliminating or mitigating the severity of rain and wind action

All of the above