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SCSC 301 Exam 2 With Correct Answers

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SCSC 301 Exam 2 With Correct Answers .Accumulation of nutrients in ponds, lakes and ground water can lead to—— - ANSWER-Eutrophication .Actinobacteria - ANSWER--Filamentous, forming branching chains -Aerobic heterotrophs, non-acidic, moist, high C environments - produces antibiotics (an...

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  • October 17, 2024
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SCSC 301 Exam 2 With Correct Answers

.Accumulation of nutrients in ponds, lakes and ground water can lead to—— - ANSWER-Eutrophication



.Actinobacteria - ANSWER--Filamentous, forming branching chains

-Aerobic heterotrophs, non-acidic, moist, high C environments

- produces antibiotics (antimicrobial)

-Some fix N especially in forests (Frankia sp.)

Microorganism



.Adhesion - ANSWER-An attraction between molecules of different substances



.Aerobe - ANSWER-an organism that requires oxygen for respiration and can live only in the presence of
oxygen



.Algae - ANSWER--Photosynthetic, autotrophs, primary producers

-Wet surface soils

-Can form symbiotic relationship with fungi to form lichen

-Microfauna

-some thrive in hot or cold environments



.Anaerobe - ANSWER-an organism that does not require free oxygen in order to respire, can only grow in
the absence of oxygen.



.Angle between H-O-H is - ANSWER-105*



.Archaea - ANSWER--Single-celled

-can make up to 10% of soil microbes

-Extremophiles! (Can live in extreme conditions)

,- Hot spring, sulfuric locations, volcano vents, permafrost, anaerobic (methanogens)



.Autotroph - ANSWER-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.



.Bacteria - ANSWER--Most abundant in soils

-Prokaryotic, single-celled

-Rapid repro

-heterotrophic but some auto

-Bioremediation, decomp, nutrient cycling, carbon sequestration

Important for nearly every aspect of soil functioning



.Biocrusts - ANSWER--protect soil from erosion

-intact crust= healthy system

-improves desert productivity

-arid environments

Mutualistic associations b/t fungi's

-microfauna



.Capillarity - ANSWER-the attraction between molecules that results in the rise of a liquid in small tubes



.Capillary movement due to - ANSWER-Adhesion and cohesion



.Capillary movement varies because - ANSWER-Trapped air and lack of uniformity



.Clay soils have- - ANSWER-Greater capillary movement, larger distance but slower

, .Cohesion - ANSWER-Attraction between molecules of the same substance

Responsible for surface tension



.Control of ET - ANSWER--Irrigation

-Limit plant growth

-Sow fewer seeds or farther apart

-Eliminate weeds

-Eliminate vegetation for a period prior



.Control of Evaporation (E) - ANSWER--Mulch



.Cycling water times - ANSWER-Surface of ocean



Lakes: varies



Rivers: 20 days



Atmosphere: 10 days



Soil moisture: 1 month



.Domains of life - ANSWER-1. Bacteria (prokaryotes)

2. Archaea (microorgs, extremophiles, methanotrophs)

3. Eukarya (fungi, insects, plants, mammals, humans)



All three can be found in soil microbiome



.Drainage - ANSWER-Removal of groundwater or surface water, or of water from structures, by gravity
usually

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