The major useful component of the atmosphere is

A. neon

B. air

C. dust particles

D. carbon dioxide

E. oxygen

The sunshine duration of a place is recorded by a

A. cup anemometer

B. sundial

C. sunshine recorder

D. thrmometer

E. barometer

In humid climates, the process by which dissolved minerals in a horizon of the soil are transported downwards is known as

A. Teaching

B. calcification

C. oxidation

D. transpiration

E. percolation

Which of the following crops requires sandy porous and well aerated soils for growth?

A. Tea

B. Coffee

C. Rice

D. Cocoa

E. Groundnut

The substance that cements soil particles together is

A. air

B. nutrients

C. sand

D. colloid

E. loam

Soils of the rainforest are rich in humus because of the

A. multiple species of trees

B. dense vegetation cover

C. large quantity of decayed leaves

D. absence of sunlight at the surface

E. heavy rainfall