Who of the following has given the term rhizosphere :

1) Garret

(2) Alexopolus

(3) Hiltner

(4) None of the given options

The asha–grey soils of high–latitude coniferous forests a known as :

(1) Tundra soils

(2) Podsols

(3) Grey–Brown soils

(4) Red and Yellow soils

The remedies to soil erosion are :

\(\mathrm{I}\). Contour bunding

\(\mathrm{II}\). Regulation of land use

\(\mathrm{III}\). Cutting of trees

\(\mathrm{IV}\). Allowing grazing of animals

(1) \(\mathrm{I},\mathrm{III}\)

(2) \(\mathrm{I},\mathrm{II}\)

(3) \(\mathrm{III},\mathrm{IV}\)

(4) \(\mathrm{II},\mathrm{III}\)

In which region is Terrace farming done?

(1) Dry regions

(2) Slope of hills

(3) Mountain tops

(4) Rooftops

Alluvial soils are rich soil for crop cultivation but are poor in

(1) humus

(2) nitrogen and humus

(3) organic material

(4) inorganic material

Bamboo is classified as

(1) Tree

(2) Grass

(3) Shrub

(4) Herb

The transfer of minerals from topsoil to subsoil through soil-water is called?

(1) Percolation

(2) Conduction

(3) Leaching

(4) Transpiration

Black soil is also known by which of the following name?

(1) Khadar Soil

(2) Bangar Soil

(3) Alluvial Soil

(4) Regur soil

Salination of soil is caused by

(1) pesticides

(2) soil erosion

(3) excess irrigation

(4) crop rotation

Which one of the following is the indirect use of forests?

(1) Medicinal plants

(2) Checking soil erosion

(3) Building material

(4) Grazing

In order to prevent the expansion of deserts, trees are planted in strips or blocks with the shortest trees on the desert side and the tallest on the other side. Such plantation is called?

(1) shelterbelts

(2) agroforests

(3) windbreaks

(4) social forests