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scsc 301 exam 2 tamu smith Questions and Correct Answers the Latest Update and Recommended Version

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scsc 301 exam 2 tamu smith Questions and
Correct Answers the Latest Update and
Recommended Version
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)?

✓ Autotroph such as plants, algae, cyanobacteria, etc.



an organism that can only get carbon and energy from organic compounds?

✓ Heterotroph such as bacteria, fungi, protozoa, etc.



an organism that grows only in the presence of molecular oxygen?

✓ aerobe such as nitrifying bacteria



an organism that only grows in the absence of molecular oxygen?

✓ Anaerobe such as archaea, denitrifying bacteria, some N-fixing bacteria



an organism capable of both aerobic and anaerobic metabolism?

✓ facultative anaerobe



What functions do microorganisms provide in soil?




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✓ -soil organic matter stabilization, organic matter mixing, and aggregate formation

✓ -breakdown of toxic compounds

✓ -inorganic transformations: nutrient cycling

✓ -nitrogen fixation

✓ -plant protection



plant roots

✓ release C into soil via exudates, aid in aggregate formation, use O2 for respiration
(produce CO2)



Earthworms

✓ eat detritus (waste), organic matter and microorganisms, form burrows, "nature's tiller"
create casts- aggregation



termites

✓ complex social colonies, mound builders, symbiotic gut microbes degrade cellulose, fungi
farmers



nematodes

✓ -microbial predator- controls populations and releases plant-available N

✓ -moist, well-aggregated soils

✓ -moved by pushing or "swimming"



Tardigrades



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