SCSC 301 EXAM 2 EXAM WITH CORRECT
ACTUAL QUESTIONS AND CORRECTLY
WELL DEFINED ANSWERS LATEST 2024 –
2025 ALREADY GRADED A+
Wetting front - ANSWERS--where wet soil meets dry soil as water moves through
a soil
-water movement is due to matric potential and gravitational potential
How does a plant acquire water? - ANSWERS-Capillary movement
Root growth
Leaching - ANSWERS-Ions moving with water into soil
Saturation must occur______ going from small to big pores - ANSWERS-Before
,Hydrologic cycle - ANSWERS-The process of cycling water from the earths surface
to the atmosphere and back again
Anaerobe - ANSWERS-an organism that does not require free oxygen in order to
respire, can only grow in the absence of oxygen.
Facultative anaerobe - ANSWERS-can live with or without oxygen, is capable of
both anaerobe and aerobic metabolism.
Examples of autotrophs - ANSWERS-plants, algae, bacteria
Examples of heterotrophs - ANSWERS-Most soil organisms, bacteria, fungi,
protozoa
Examples of aerobes - ANSWERS-Most fungi, protozoa, and many bacteria
Example from lecture: Nitrifying bacteria
Autotroph - ANSWERS-an organism that can use CO2 as a C source, or obtain
energy from the sun, or from oxidation of inorganic elements or compounds (such
as iron, sulfur, hydrogen, ammonium, and nitrates)
Can make its own food.
, Heterotroph - ANSWERS-An organism that can only get carbon and energy from
organic compounds. Cant make its own food.
Aerobe - ANSWERS-an organism that requires oxygen for respiration and can live
only in the presence of oxygen
Examples of anaerobes - ANSWERS-Archaea (methanogens) and many denitrifying
bacteria
Examples of facultative anaerobes - ANSWERS-Beyond the scope of the exam :)
Function of roots - ANSWERS--Release C into soil via exudates
-Aid in aggregate formation (macro aggregate)
-Use CO2 for respiration (produce CO2)
-Primary producers
-Nutrients to bacteria and other orgs in rhizosphere
Earthworms - ANSWERS--Eat detritus, organic matter and microorganisms
-Form burrows, "natures tiller"
-Create casts- aggregation, reduce soil N loss
-Deleterious effects-(overgrazing, chemical leaching and increased GHG)
Termites - ANSWERS--Complex, social colonies
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