2024 – 2025 SCSC EXAM 2 WITH CORRECT
ACTUAL QUESTIONS AND CORRECTLY
WELL DEFINED ANSWERS LATEST 2024 –
2025 ALREADY GRADED A+
Leaching - ANSWERS-ions moving with water into soil
roots and organisms can contribute to water movement in soils via increasing -
ANSWERS-preferential flow (primarily gravitational)
Steps of erosion - ANSWERS-detachment, transportation, deposition
type of water erosion - ANSWERS-splash erosion, water erosion like sheet
(removal of thin layer of soil from area), rill (removal of soil in small channels
carved by running water), and gully (removal of soil in large channels by running
water)
an organism that only grows in the absence of molecular oxygen? - ANSWERS-
Anaerobe such as archaea, denitrifying bacteria, some N-fixing bacteria
, an organism capable of both aerobic and anaerobic metabolism? - ANSWERS-
facultative anaerobe
What functions do microorganisms provide in soil? - ANSWERS--soil organic
matter stabilization, organic matter mixing, and aggregate formation
-breakdown of toxic compounds
-inorganic transformations: nutrient cycling
-nitrogen fixation
-plant protection
plant roots - ANSWERS-release C into soil via exudates, aid in aggregate
formation, use O2 for respiration (produce CO2)
Earthworms - ANSWERS-eat detritus (waste), organic matter and microorganisms,
form burrows, "nature's tiller" create casts- aggregation
an organism that can use CO2or CO3- (i.e., inorganic C) as a C source, and obtain
energy from the sun (photo) - or from the oxidation of inorganic elements or
compounds such as iron, sulfur, hydrogen, ammonium, and nitrites (chemo)? -
ANSWERS-Autotroph such as plants, algae, cyanobacteria, etc.
an organism that can only get carbon and energy from organic compounds? -
ANSWERS-Heterotroph such as bacteria, fungi, protozoa, etc.
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