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81.

The soil formation occurs in the following consecutive stages:

A.	Weathering ? sedimentation	B.	Weathering ? pedogenesis
C.	Pedogenesis ? weathering	D.	Sedimentation ? pedogenesis

82.

A population of individuals from the same genetic stock but differing in their morphology is called:

A.	Ecotype	B.	Ecad
C.	Ecotone	D.	Life form

83.

The biological weathering commonly brought about by:

A.	Algae	B.	Bacteria
C.	Fungi	D.	Lichens

84.

Mark the draught evader:

A.	Kangaroo rat	B.	Camel
C.	Desert rat	D.	All of these

85.

The transition zone between two different types of communities is called:

A.	Biome	B.	Ecotone
C.	Biological spectrum	D.	Biological clock

86.

A passive factor which affects formation of soil:

A.	Nature of parent material	B.	Annual rainfall
C.	Wind velocity	D.	Mean temperature

87.

The science of ecology has been defined as the study of the structure and function of nature by:

A.	Odum	B.	Misra
C.	Warming	D.	Maeckel

88.

Solum' includes:

A.	Horizons A1 and A2 only	B.	Horizon A only
C.	Horizons A2 and B only	D.	Horizons A and B

89.

The rock cover of the earth is called:

A.	Lithosphere	B.	Xerosphere
C.	Pasmmosphere	D.	Pedosphere

90.

Which of the following horizons has the maximum amount of organic matter?

A.	Horizons A2 and B	B.	Horizon B only
C.	Horizon A1	D.	Horizons B and C