SOIL - Jamb Biology Past Questions and Answers

Question 61:

• JAMB 2009

Mass of crucible = 10g
Mass of crucible and soil before heating = 29g
Mass of a crucible and soil after heating = 18g
From the information above, determine the percentage of water in the given soil sample?

A. 20%
B. 25%
C. 40%
D. 50%

Question 62:

• JAMB 2010

The loss of soil through erosion can be reduced by

A. Watering
B. Crop rotation
C. Manuring
D. Irrigation

Question 63:

• JAMB 2011

In an experiment to determine the percentage of humus and water in a soil sample, the following results were obtained
Weight of the evaporating basin alone = 80.5g
Weight of basin and soil = 101.5g
Weight after drying the soil in the oven = 99.0g
Weight of basin and roasted soil = 95.5g
The percentage of humus in the soil sample is

A. 16.7%
B. 17.6%
C. 26.7%
D. 16.2%

Question 64:

• JAMB 2012

An indigenous method of renewing and maintaining soil fertility is by

A. Clearing farms by burning
B. Planting one crop type
C. Adding inorganic fertilizers yearly
D. Crop rotation and shifting cultivation

Question 65:

• JAMB 2014

The influence of soil on organisms in a habitat is referred to as

A. Edaphic
B. Physiographic
C. Biotic
D. Topographic