Download PTU B.Sc-Agriculture 2020 March 1st Sem 72211 Soil Science I Question Paper

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B.Sc. (Agriculture) (2014 to 2018)/Hons. (Agriculture)
(Sem.-1)
SOIL SCIENCE-I
Subject Code : BSAG-104

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INSTRUCTIONS TO CANDIDATES :

1. SECTION-A is COMPULSORY consisting of TEN questions carrying TWO marks each.
2. SECTION-B contains FIVE questions carrying FIVE marks each and students have to attempt any FOUR questions.

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3. SECTION-C contains THREE questions carrying TEN marks each and students have to attempt any TWO questions.

SECTION-A

1. Write short notes on the following :
   1. Colluvium
   2. Eluviation
   3. Volatilization

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   4. Denitrification
   5. Marshy soils
   6. Soil colloid
   7. Cation exchange capacity
   8. Bulk density

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   9. Infiltration rate
   10. Charge on clay micelle

SECTION-B

2. Explain the composition of earth crust with the help of diagram.

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3. Bulk density and particle density of a field were reported as 1.60 and 2.75 respectively. Calculate the percent porosity of soil.
4. Derive a relation among bulk density, particle density and porosity.
5. Enlist processes of soil formation and discuss role on any one in detail.
6. What is the source of negative charge on silicate clay minerals?

SECTION-C

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7. Derive mathematically Darcy’s law showing movement of water under unsubmerged conditions.
8. Describe the conditions under which acidic soils are formed and write in detail about their reclamation.
9. Define rock and explain its detailed classification.

NOTE : Disclosure of Identity by writing Mobile No. or Making of passing request on any page of Answer Sheet will lead to UMC against the Student.

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