ISA Arborist Certification Chapter 3 - Soil
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Science questions with answers |\ |\ |\
0 Horizon, an unaltered soil, thin layer of decomposing
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organic matter - CORRECT ANSWERS ✔✔organic layer
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A mix of three different particle sizes and is often
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considered an ideal soil texture because of the favorable |\ |\ |\ |\ |\ |\ |\ |\ |\
characteristics for plant growth. |\ |\ |\
Not made up of equal mix of sand, silt, clay. Contains less
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clay - CORRECT ANSWERS ✔✔Loam
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commonly known as the uppermost layers (O,A,E, and |\ |\ |\ |\ |\ |\ |\ |\
sometimes the upperpart of B horizon) - CORRECT |\ |\ |\ |\ |\ |\ |\ |\
ANSWERS ✔✔Topsoil |\
Deepest Soil layer composed of partially weathered
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parent material. Soil in this horizon is continually forming.
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- CORRECT ANSWERS ✔✔C Horizon
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Contains most of the fine absorbing roots of trees and is
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very biologically active. Rich in organic matter. -
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CORRECT ANSWERS ✔✔A Horizon |\ |\ |\
, Between the A and B Horizon, lacks the organic matter as
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in A, has lighter color due to this. - CORRECT ANSWERS
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✔✔E Horizon |\
Roots found in the upper 6-10 inches of soil - CORRECT
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ANSWERS ✔✔Absorbing Roots |\ |\
Few_____ grow deeper than 3 to 4 ft. - CORRECT |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
ANSWERS ✔✔Roots |\
Shape, size, strength, and arrangement of soil aggregates
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form ____. - CORRECT ANSWERS ✔✔Soil Structure
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Soil pores that retain water and are the source of
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available water to plants between rainfalls. - CORRECT
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ANSWERS ✔✔Micropores |\
Soil pores too large to hold water against the force of
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gravity and become filled with air as water drains from
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the soil. - CORRECT ANSWERS ✔✔Macropores
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Mass of dried soil per unit of undisturbed soil volume. Can
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be used to assess whether adequate pore space exists. -
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CORRECT ANSWERS ✔✔Bulk Density |\ |\ |\
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Science questions with answers |\ |\ |\
0 Horizon, an unaltered soil, thin layer of decomposing
|\ |\ |\ |\ |\ |\ |\ |\ |\
organic matter - CORRECT ANSWERS ✔✔organic layer
|\ |\ |\ |\ |\ |\
A mix of three different particle sizes and is often
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
considered an ideal soil texture because of the favorable |\ |\ |\ |\ |\ |\ |\ |\ |\
characteristics for plant growth. |\ |\ |\
Not made up of equal mix of sand, silt, clay. Contains less
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
clay - CORRECT ANSWERS ✔✔Loam
|\ |\ |\ |\
commonly known as the uppermost layers (O,A,E, and |\ |\ |\ |\ |\ |\ |\ |\
sometimes the upperpart of B horizon) - CORRECT |\ |\ |\ |\ |\ |\ |\ |\
ANSWERS ✔✔Topsoil |\
Deepest Soil layer composed of partially weathered
|\ |\ |\ |\ |\ |\ |\
parent material. Soil in this horizon is continually forming.
|\ |\ |\ |\ |\ |\ |\ |\
- CORRECT ANSWERS ✔✔C Horizon
|\ |\ |\ |\ |\
Contains most of the fine absorbing roots of trees and is
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
very biologically active. Rich in organic matter. -
|\ |\ |\ |\ |\ |\ |\ |\
CORRECT ANSWERS ✔✔A Horizon |\ |\ |\
, Between the A and B Horizon, lacks the organic matter as
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
in A, has lighter color due to this. - CORRECT ANSWERS
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✔✔E Horizon |\
Roots found in the upper 6-10 inches of soil - CORRECT
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
ANSWERS ✔✔Absorbing Roots |\ |\
Few_____ grow deeper than 3 to 4 ft. - CORRECT |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
ANSWERS ✔✔Roots |\
Shape, size, strength, and arrangement of soil aggregates
|\ |\ |\ |\ |\ |\ |\
form ____. - CORRECT ANSWERS ✔✔Soil Structure
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Soil pores that retain water and are the source of
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
available water to plants between rainfalls. - CORRECT
|\ |\ |\ |\ |\ |\ |\ |\
ANSWERS ✔✔Micropores |\
Soil pores too large to hold water against the force of
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
gravity and become filled with air as water drains from
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
the soil. - CORRECT ANSWERS ✔✔Macropores
|\ |\ |\ |\ |\
Mass of dried soil per unit of undisturbed soil volume. Can
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
be used to assess whether adequate pore space exists. -
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
CORRECT ANSWERS ✔✔Bulk Density |\ |\ |\
