General Directions
1. Select the correct answer for each of the
following questions
2. Encircle the letter of the correct answer
3. Encircling two or more letters will invalidate
your answer
4. Avoid erasures
...
General Directions
1. Select the correct answer for each of the
following questions
2. Encircle the letter of the correct answer
3. Encircling two or more letters will invalidate
your answer
4. Avoid erasures
5. Any form of cheating is strictly prohibited
Multiple Choice
1. Nitrification carried out by autotrophic bacteria
is not affected by which of the following?
a. pH
b. Temperature
c. Oxygen supply
d. Redox potential
e. Soil OM
2. Soil microorganism that degrade carboncontaining pesticides are considered
a. Autotrophs
b. Chemotrophs
c. Heterotrophs
d. Phototrophs
e. None of the above
3. The Philippine adopts the _____Soil
Classification System
a. United States Department of
Agriculture (USDA)
b. Food and Agriculture (FAO)
c. International Soil Science Society (ISSS)
d. Soil Science Society of America(SSSA)
4. The biochemical oxidation of ammonium to
nitrate, predominantly by autotrophic bacteria
a. Denitrification
b. Ammonium fixation
c. Nitrification
d. Immobilization
5. In strongly acid soils, the availability of most
micronutrients cation is
a. Increased
b. Decreased
c. Not affected
d. Remains the same
6. The percent water remaining in soil 2 to 3 days
after its having been saturated and after free
drainage has practically ceased
a. Permanent wilting point
b. Wilting coefficient
c. Plant available water
d. Field capacity
7. Most of the N in the soil solid fraction of the
soil is in the form of
a. Ammonium N
b. Nitrate N
c. Nitrite N
d. Organic N
e. Fixed N
8. Nitrate is not removed from the soil system
by which of the following
a. Leaching
b. Plant uptake
c. Nitrogen fertilization
d. Erosion
e. Run-off
[Show More]
