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201.

In the diffusion, the movement of ions takes place:

A.	From the region of higher concentration to the lower concentration	B.	From the region of lower concentration to the higher concentration
C.	Both are correct	D.	None of the above

202.

In the P-determination by Olsen method, the ration of soil and extractant should be:

A.	1;20	B.	1;100
C.	1;10	D.	1;50

203.

Iron helps in chlorophyll synthesis because:

A.	It is associated with chlorophyll	B.	It is absent in chlorophyll
C.	It activates enzyme nitrogen reductase	D.	None of the above

204.

Which one of the following sets of soil condition is more suitable for plant growth?

A.	Sandy soils with high aeration and low water holding capacity	B.	Clay soils with higher water holding capacity and low aeration
C.	Organic soils with high water holding capacity and low aeration	D.	Loamy soils with medium aeration and medium water holding capacity

205.

Irrigation with sodic water increase the availability of:

A.	Sodium	B.	Molybdenum
C.	Zinc	D.	Chloride

206.

Is called father of pedology:

A.	V.V. Dokuchaev	B.	D.G. Vilensky
C.	C.F. Marbut	D.	K.D. Glinka

207.

Is potassium takes parts in metabolic activity?

A.	Yes	B.	No
C.	May or may not be	D.	None of the above

208.

K in igneous rocks is about:

A.	8.90%	B.	2.50%
C.	3.10%	D.	18.50%

209.

K2 (Si5 Al2)Al4O2 (OH)4 is the formula of:

A.	Muscovite	B.	Biotite
C.	Monmorillonite	D.	Kaolinite

210.

Kaolinite is a ______ type clay mineral:

A.	1;1	B.	2;1
C.	2;2	D.	None of these