Humus is a type of

(1) fossil seen on the rocks

(2) decaying organic matters in soil

(3) fertilizers applied in soil

(4) special growth found in plants

A significant quantity of upper soil is formed by

(1) Igneous rock

(2) Sedimentary rock

(3) Metamorphic rock

(4) Biological degradation

In a desert region, soil erosion can be checked by

(1) Tree plantation/afforestation

(2) Crop rotation

(3) Contour ploughing

(4) Using farm manure

Alluvial soils are usually

(i) Rich in nitrogen

(ii) Poor in humus

(iii) Highly fertile

(iv) Easy to plough

(1) (i), (ii) and (iv)

(2) (ii), (iii) and (iv)

(3) (i), (iii) and (iv)

(4) (i), (ii) and (iii)

The land which is not cultivated every year though it is suitable for cultivation :

(1) Wasteland

(2) Pastureland

(3) Fallow land

(4) Cultivable wasteland

The organic matter present in the soil is known collectively as

(1) Hydrocarbons

(2)Podsols

(3) Humus

(4)Colloids

Which one of the following soils is used for the production of bricks?

(1) Peaty and organic

(2) Saline

(3) Laterite

(4) Red and yellow

Plantation of trees on a large scale to check soil erosion are called:

(1) Shelterbelts

(2) Contour ploughing

(3) Strip cropping

(4) Afforestation

Soil formed by leaching and oxidation is

(1) Black soil

(2) Laterite soi

l (3) Red soil

(4) Montane soil

Soil that is prone to intensive leaching due to rain is called

(1) Laterite

(2) Black

(3) Alluvial

(4) Red

Soil factors are otherwise known as :

(1) Edaphic factors

(2) Biotic factors

(3) Physiographic factors

(4) Climatic factors