SCSC 301 Exam 2 Questions With
Complete Solutions!!
mottle - ANSWERA splotch (or spot) of one color in a horizon of soil that is
predominantly another color is a ______.
2 - ANSWERA soil has a color of 7.5YR 2/6, the value is __________ , which
indicates that the soil's color is relatively intense
54 - ANSWERThe soil bulk density is 1.2 g/cm3 and the particle density is 2.6
g/cm3. What is the percentage of pore space (i.e., porosity) of the soil________%
fungi - ANSWERThis group of organisms plays an important role in decomposition of
residues in acidic forest soils. They can be found both above and below the soil
surface.
mycorrhizae - ANSWERThis organism is able to form a symbiotic relationship with
plants that improves the plant's ability to acquire water and nutrients and may also
protect against pests, while the organism receives a food source directly from the
plant.
Actinomycetes - ANSWERWhich of the following is a type of bacteria?
- yeast
- nematode
- protozoa
-mycorrhizae
- actinomycetes
mycorrhizae and mold - ANSWERWhich of the following are types of fungi?
- mycorrhizae and actinomycetes
- yeast and actinomycetes
- mycorrhizae and mold
- bacteria and actinomycetes
- protozoa and nematodes
actinomycetes - ANSWERWhich group of soil organisms is often responsible for
decomposition of organic residues, particularly those that are more resistant to
degradation, in neutral to alkaline soils?
- mycorrhizae
- actinomycetes
- nematodes
- algae
- bacteria
all are correct - ANSWERWhich of the following affects microorganism growth
, - Soil pH and exchangeable Ca
- Organic matter type and abundance in soil
- All are correct
- Oxygen available
- Soil moisture and temperature
immobilized - ANSWERWhen organic substances (e.g., cellulose, protein, lignin) are
part of an organism, they are said to be _________ because those nutrients and
carbon are not available for other organisms to use.
heterotroph - ANSWERAn organism that cannot make its own carbon compounds
from CO2 is a/an ____.
It is negatively charged due to carboxyl, phenolic, and alcoholic group -
ANSWEROrganic matter generally is good a retaining some nutrients. Which of the
following is true about the charge of organic matter that causes it to retain nutrients?
- It is positively charged due to carboxyl, phenolic, and alcoholic groups
- It is negatively charged due to carboxyl, phenolic, and alcoholic group
- It is positively charged due to phosphate, sulfate, and nitrate groups
- It is negatively charged due to phosphate, sulfate, and nitrate groups
tillage and cultivation - ANSWERWhich management activity is most likely to lead to
the loss of soil organic matter?
- fertilization
- irrigation
- maintaining native - pasture and/or forest
- manure compost additions
- tillage and cultivation
organic matter decomposition - ANSWERWhich of the following is a major role of soil
microorganisms?
- photosynthesis
- all are correct
- organic matter decomposition
- none are correct
- deposition of large quantities of vegetative biomass
disperse clay colloids - ANSWERWhich of the following is something soil organisms
DO NOT typically do in the soil?
- fix nitrogen from the atmosphere into biologically available forms
- physically mix the soil
- transform organic N to inorganic forms, such as NH4+ and NO3-
- degrade toxins and foreign compounds
- disperse clay colloids
protein - ANSWERWhich of the following is an organic carbon compound?
Complete Solutions!!
mottle - ANSWERA splotch (or spot) of one color in a horizon of soil that is
predominantly another color is a ______.
2 - ANSWERA soil has a color of 7.5YR 2/6, the value is __________ , which
indicates that the soil's color is relatively intense
54 - ANSWERThe soil bulk density is 1.2 g/cm3 and the particle density is 2.6
g/cm3. What is the percentage of pore space (i.e., porosity) of the soil________%
fungi - ANSWERThis group of organisms plays an important role in decomposition of
residues in acidic forest soils. They can be found both above and below the soil
surface.
mycorrhizae - ANSWERThis organism is able to form a symbiotic relationship with
plants that improves the plant's ability to acquire water and nutrients and may also
protect against pests, while the organism receives a food source directly from the
plant.
Actinomycetes - ANSWERWhich of the following is a type of bacteria?
- yeast
- nematode
- protozoa
-mycorrhizae
- actinomycetes
mycorrhizae and mold - ANSWERWhich of the following are types of fungi?
- mycorrhizae and actinomycetes
- yeast and actinomycetes
- mycorrhizae and mold
- bacteria and actinomycetes
- protozoa and nematodes
actinomycetes - ANSWERWhich group of soil organisms is often responsible for
decomposition of organic residues, particularly those that are more resistant to
degradation, in neutral to alkaline soils?
- mycorrhizae
- actinomycetes
- nematodes
- algae
- bacteria
all are correct - ANSWERWhich of the following affects microorganism growth
, - Soil pH and exchangeable Ca
- Organic matter type and abundance in soil
- All are correct
- Oxygen available
- Soil moisture and temperature
immobilized - ANSWERWhen organic substances (e.g., cellulose, protein, lignin) are
part of an organism, they are said to be _________ because those nutrients and
carbon are not available for other organisms to use.
heterotroph - ANSWERAn organism that cannot make its own carbon compounds
from CO2 is a/an ____.
It is negatively charged due to carboxyl, phenolic, and alcoholic group -
ANSWEROrganic matter generally is good a retaining some nutrients. Which of the
following is true about the charge of organic matter that causes it to retain nutrients?
- It is positively charged due to carboxyl, phenolic, and alcoholic groups
- It is negatively charged due to carboxyl, phenolic, and alcoholic group
- It is positively charged due to phosphate, sulfate, and nitrate groups
- It is negatively charged due to phosphate, sulfate, and nitrate groups
tillage and cultivation - ANSWERWhich management activity is most likely to lead to
the loss of soil organic matter?
- fertilization
- irrigation
- maintaining native - pasture and/or forest
- manure compost additions
- tillage and cultivation
organic matter decomposition - ANSWERWhich of the following is a major role of soil
microorganisms?
- photosynthesis
- all are correct
- organic matter decomposition
- none are correct
- deposition of large quantities of vegetative biomass
disperse clay colloids - ANSWERWhich of the following is something soil organisms
DO NOT typically do in the soil?
- fix nitrogen from the atmosphere into biologically available forms
- physically mix the soil
- transform organic N to inorganic forms, such as NH4+ and NO3-
- degrade toxins and foreign compounds
- disperse clay colloids
protein - ANSWERWhich of the following is an organic carbon compound?
