Crop rotation is used by farmers to increase
Soil fertility
Community area
Organic content of soil
Nitrogenous content in the soil
The trees occurring in two storeys is the characteristic feature of
Mediterranean scrub forests
Tropical savannah
Temperate deciduous forests
Northern coniferous forests
Planting of trees on public land is known as
Social forestry
Farm forestry
Agroforestry
Reforestation
Savannas are
Desert
Tropical rain forest
Grassland with scattered trees
Dense forest with cose canopy
Deforestation causes
Soil erosion
Soil pollution
Water pollution
Noise pollution
An excessive felling of trees leads to
Increase of fertility
Increases in soil erosion
Decrease in productivity
Both '1' and '3'
Deciduous forests are mainly found, in the region where annual precipitation ranges between
25-75 cm
75-100 cm
125-150 cm
above 200 cm
Afforestation (planting of tree in new areas) is done by
Eucalyptus
Bamboos
Exotic species
Indigenous plants
Which of the following prevents afforestation in deserts?
Low rainfall
Grazing animals
Planting trees
Unfertility of soil
Man and biosphere programme (MAB) was launched by
WPSI
IUCNNR
UNESCO
WHO
