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WorksheetsCROPSCI 02 SOIL 101 QUIZ BEE
Total questions: 20
Worksheet time: 5hrs 0mins
Soil organism activities help maintain all EXCEPT:
Clean water and air
Balanced water flow
Healthy plant growth
Increased soil salinity
Soil organisms play an important role mainly because they:
Reduce soil porosity
Carry out biochemical transformations
Increase salinity
Destroy soil fertility
Earthworms thrive best in:
Acidic soils
Infertile soils
Fertile, alkaline soils
Waterlogged soils
Eisenia foetida is the:
Nightcrawler
Pale red worm
Compost worm
Asian swamp worm
Lumbricus terrestris is an example of:
Anecic
Epigeic
Endogeic
Parasitic worm
Protozoa feed mainly on:
Plants
Bacteria
Worms
Soil minerals
Protozoa form cysts to:
Survive harsh conditions
Fix nitrogen
Produce antibiotics
Absorb sunlight
Cocci bacteria are:
Spiral
Spherical
Rod-shaped
Thread-like
Chemosynthetic bacteria use energy from:
Sunlight
Inorganic compounds
Fungi
Animals
Bacterial populations in soil range from:
10–100 CFU/g
10³–10⁴ CFU/g
10⁶–10⁹ CFU/g
>10¹² CFU/g
Obligate anaerobes grow only in:
Oxygen-rich soil
High sunlight
Oxygen-free environments
Moist but aerated soil
Bacteria that tolerate oxygen but don’t use it are:
Aerobes
Anaerobes
Aerotolerant anaerobes
Microaerophiles
Mesophiles grow best at:
–15 to 10°C
20–45°C
45–122°C
100°C
Thermophiles thrive in:
Ice
Cold deserts
Hot compost
Dark caves
Actinomycetes produce:
Antibiotics
Chlorophyll
Toxic gases
Carbon dioxide only
Fungal biomass in soil is about:
8,000 kg/HFS
2,000 kg/HFS
250 kg/HFS
4,000 kg/HFS
SOM is higher in:
Sandy soils
Clayey soils
Dry, hot soils
Recently tilled fields
SOM increases:
Bulk density
Soil compaction
Water retention
Soil salinity
Mineralization converts organic N to:
N₂
NO₃⁻
Proteins
NH₄⁺
Denitrification is done by:
Obligate aerobes
Facultative anaerobes
Actinomycetes
Protozoa
