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471.

The residual effect of ammonical nitrogenous fertilizer in soil is:

A.	Alkaline	B.	Neutral
C.	Acidic	D.	None of the above

472.

The rice crop tolerates submergence because:

A.	The plant does not need O2	B.	The plant has mechanism to transport O2 through leaves
C.	Bacteria keep the rhizosphere oxidised	D.	O2 penetrating to root zone through air movement is sufficient

473.

The rock 'Quartzite' is a:

A.	Sedimentary rock	B.	Igneous rock
C.	Metamorphic rock	D.	None of these

474.

The rock "Granite" is a:

A.	Sedimentary rock	B.	Metamorphic rock
C.	Igneous rock	D.	None of above

475.

The rock, which is formed by sedimentation of primary rock, is called:

A.	Igneous rock	B.	Metamorphic rock
C.	Sedimentary rock	D.	None of these

476.

The rock, which is formed under high temperature and pressure and by sudden geological tectonic movement, is called:

A.	Igneous rock	B.	Sedimentary rock
C.	Metamorphic rock	D.	None of these

477.

The saline soil can be managed by:

A.	Addition of gypsum	B.	Addition of lime
C.	Addition of pyrite	D.	Leaching of salts

478.

The sodicity of water can be expressed by:

A.	ECE	B.	SAR
C.	ESP	D.	All of the above

479.

The soil layer of maximum leaching is indicated by the symbol

A.	A1	B.	A2
C.	B1	D.	B2

480.

The soil solum includes:

A.	A horizon	B.	B horizon
C.	A and B Horizon	D.	None of the above