NR 501 STUDIO SOILS EXAM 2 QUESTIONS
WITH CORRECT ANSWERS 2025/2026
The relative abundance of soil organisms from most to least - CORRECT ANSWER -Bacteria and
fungi, Mircofauna, Macrofauna, Worms
Amount of worms in 1 handful of soil - CORRECT ANSWER -1 earthworm/snail/slug
Amount of macrofauna in 1 handful of soil - CORRECT ANSWER -50,000
amount of protozoa (microfauna) in 1 handful of soil - CORRECT ANSWER -20 million
amount of nematodes (microfauna) in 1 handful of soil - CORRECT ANSWER -100,000
amount of bacteria in 1 handful of soil - CORRECT ANSWER -200 billion
length of fungal hyphae in 1 handful of soil in meters - CORRECT ANSWER -100,000 meters
major group of soil organisms containing bacteria, archaea, fungi/mycorrhizae - CORRECT
ANSWER -Microbes
major group of soil organisms containing protozoa, nematodes
consumers of soil microbes, release plant available nutrients - CORRECT ANSWER -Microfauna
major group of soil organisms including collembola, rotifers, mites, earthworms
, shredders of organic matter, consumers of smaller organisms - CORRECT ANSWER -Macrofauna
primary producer organisms in soil - CORRECT ANSWER -plants
trophicWlevelWinWsoilWfoodWwebWthatWcontainsWphotosynthesizers;
Plants
(1st,W2nd,3rdW,4thW,5th+)W-WCORRECTWANSWERW-1st
trophicWlevelWinWsoilWfoodWwebWthatWcontainsWdecomposers,Wmutualists,Wpathogens,Wparasites,Wr
ootWfeedersW;
Nematodes,Wfungi,Wbacteria
(1st,W2nd,3rdW,4thW,5th+)W-WCORRECTWANSWERW-2nd
trophicWlevelWinWsoilWfoodWwebWthatWcontainsWshredders,Wpredators,WgrazersW;
arthropods,Wnematodes,Wprotozoa
(1st,W2nd,3rdW,4th,5th+)W-WCORRECTWANSWERW-3rd
trophicWlevelWinWsoilWfoodWwebWthatWcontainsWhigherWlevelWpredatorsW
arthropods,Wnematodes
(1st,W2nd,3rdW,4thW,5th+)W-WCORRECTWANSWERW-4th
WITH CORRECT ANSWERS 2025/2026
The relative abundance of soil organisms from most to least - CORRECT ANSWER -Bacteria and
fungi, Mircofauna, Macrofauna, Worms
Amount of worms in 1 handful of soil - CORRECT ANSWER -1 earthworm/snail/slug
Amount of macrofauna in 1 handful of soil - CORRECT ANSWER -50,000
amount of protozoa (microfauna) in 1 handful of soil - CORRECT ANSWER -20 million
amount of nematodes (microfauna) in 1 handful of soil - CORRECT ANSWER -100,000
amount of bacteria in 1 handful of soil - CORRECT ANSWER -200 billion
length of fungal hyphae in 1 handful of soil in meters - CORRECT ANSWER -100,000 meters
major group of soil organisms containing bacteria, archaea, fungi/mycorrhizae - CORRECT
ANSWER -Microbes
major group of soil organisms containing protozoa, nematodes
consumers of soil microbes, release plant available nutrients - CORRECT ANSWER -Microfauna
major group of soil organisms including collembola, rotifers, mites, earthworms
, shredders of organic matter, consumers of smaller organisms - CORRECT ANSWER -Macrofauna
primary producer organisms in soil - CORRECT ANSWER -plants
trophicWlevelWinWsoilWfoodWwebWthatWcontainsWphotosynthesizers;
Plants
(1st,W2nd,3rdW,4thW,5th+)W-WCORRECTWANSWERW-1st
trophicWlevelWinWsoilWfoodWwebWthatWcontainsWdecomposers,Wmutualists,Wpathogens,Wparasites,Wr
ootWfeedersW;
Nematodes,Wfungi,Wbacteria
(1st,W2nd,3rdW,4thW,5th+)W-WCORRECTWANSWERW-2nd
trophicWlevelWinWsoilWfoodWwebWthatWcontainsWshredders,Wpredators,WgrazersW;
arthropods,Wnematodes,Wprotozoa
(1st,W2nd,3rdW,4th,5th+)W-WCORRECTWANSWERW-3rd
trophicWlevelWinWsoilWfoodWwebWthatWcontainsWhigherWlevelWpredatorsW
arthropods,Wnematodes
(1st,W2nd,3rdW,4thW,5th+)W-WCORRECTWANSWERW-4th
