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441.

The negative logarithm of H+ ion concentration (activity) in the soil-solution:

A.	Acidity	B.	Salinity
C.	Alkalinity	D.	pH

442.

The Neubauer seedling method is used to evaluate the soil fertility. The test plants used in this method is:

A.	Barely seedling	B.	Wheat seedling
C.	Rye or Oat seedling	D.	All of the above can be used

443.

The new comprehensive soils classification is based on:

A.	Genetic characters	B.	Physical and chemical properties of soils
C.	Both (a) & (b)	D.	None of the above

444.

The number of essential elements required for the growth of higher plant is:

A.	3	B.	6
C.	8	D.	16

445.

The number of functional plant nutrient is:

A.	6	B.	20
C.	16	D.	10

446.

The oblique type of soil structure has about:

A.	25 - 30% pore space	B.	40 - 45% pore space
C.	5 - 10% pore space	D.	15 - 20% pore space

447.

Which of the following soil texture is more heavier than other?

A.	Loamy sand	B.	Silty day loam
C.	Loam	D.	Silty loam

448.

The organic matter of soils is ordinarily obtained by multiplying the organic carbon content by:

A.	1.52	B.	1.62
C.	1.72	D.	1.82

449.

The organism, which can survive at the temperature 10 - 15?C, is called:

A.	Psychrophylic	B.	Mesophytic
C.	Thermoduric	D.	Thermophilic

450.

The P2O5 content is P in the plough layer of 1 ha of soil containing 0.1%. P2O5 is:

A.	430 kg	B.	860 kg
C.	1290 kg	D.	1500 kg