Soil 100: Introduction To Soil Science Question Paper
Soil 100: Introduction To Soil Science
Course:Bachelor Of Science In Agriculture
Institution: Chuka University question papers
Exam Year:2013
CHUKA
UNIVERSITY
UNIVERSITY EXAMINATIONS
FIRST YEAR EXAMINATION FOR THE AWARD OF DEGREE OF
BACHELOR OF SCIENCE IN AGRICULTURE, NATURAL RESOURCES
AND ANIMAL SCIENCE
SOIL 100: INTRODUCTION TO SOIL SCIENCE
STREAMS: BSc. AGRIC, NARE, ANSC TIME: 2 HOURS
DAY/DATE: TUESDAY 7/8/2013 8.30 A.M. – 10.30 A.M.
INSTRUCTIONS:
ANSWER ALL QUESTIONS IN SECTION I AND ANY TWO IN SECTION II
SECTION I: (30 MARKS)
Q1. (a) What is cation exchange capacity? Briefly explain. [3 marks]
(b) Distinguish between loess and colluvium soils. [2 marks]
Q2. (a) A sample of soil weighs 150gms when moist and 110gms after oven drying
at 105-110oC. If it has a bulk density of 1.2g/cc, what is the percent water
of soil by volume? [2 marks]
(b) Assume a soil has a bulk density of 1.56mg/m3 and a particle density of
2.6mg/m3. Calculate the porosity of the soil and the portion of the soil
occupied by the solid particles. [3 marks]
(c) Explain the importance of terracing as a soil conservation measure. [3 marks]
Q3. (a) With an example briefly explain the special purpose surveys. [4 marks]
(b) Briefly explain four functions of water in relation to plant growth. [4 marks]
Q4. (a) Briefly describe the significance of topography in soil formation. [4 marks]
(b) Explain five factors which can lead to the destruction of soil tilth. [5 marks]
SECTION II: (40 MARKS)
Q5. (a) In reference to soil formation discuss the rock cycle. [15 marks]
(b) What is the importance of soil temperature in growth of any crop?
Briefly explain. [5 marks]
Q6. (a) Discuss the positive role of micro-organisms in soil and crop production.
[12 marks]
(b) Describe the soil characteristics important in agricultural production that
are affected by soil structure. [8 marks]
Q7. (a) Describe the physical weathering of rocks. [10 marks]
(b) Explain role of climate in soil formation. [10 marks]
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