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91.

A part of the rock forming material of the earth comprises:

A.	Oxides of Ca and Na	B.	Oxides of Ca and K
C.	Aluminosilicates of Na, K and Ca	D.	Nitrates of Fe and Al

92.

The term 'hexicology' was proposed by:

A.	Elton	B.	Mivart
C.	Reiter	D.	Misra

93.

The processes involved in the chemical weathering are:

A.	Carbonation and oxidation	B.	Hydrolysis and chelation
C.	Hydrolysis and reduction	D.	All of these

94.

A population of individuals of a species which are interfertile but differ genetically is called:

A.	Ecad	B.	Ecotone
C.	Ecotype	D.	Biome

95.

The biological weathering occurs due to the action of:

A.	Acids	B.	Alkalies
C.	Oxygen	D.	Carbon dioxide

96.

Which of the following is not taken into zccount in the study of ecology?

A.	Statistics	B.	Radiation
C.	Embryology	D.	All of these

97.

Soils transported by water are called:

A.	Alluvial	B.	Colluvial
C.	Residual	D.	Eolian

98.

The grasslands do not possess the horizon layers:

A.	A00	B.	A1
C.	Both (a) & (b)	D.	A00 and A1

99.

The hydrologic factor refers to:

A.	Atmosphere	B.	Water
C.	Gravitational water	D.	Snow

100.

The soil cover of the earth lies between:

A.	Atmosphere and lithosphere	B.	Lithosphere and biosphere
C.	Atmosphere and hydrosphere	D.	All of these