Multiple Choice
Which soil horizon is typically richest in organic material and is most affected by climate variations?
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35. Soil
Soil and Nutrients
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The particles in soil are important because they __________.
A
are composed of nitrogen needed by plants
B
eliminate spaces for air and facilitate drainage
C
fill spaces and keep oxygen out of the soil
D
supply humus needed by plants
E
are charged and hold ions needed by plants
Verified step by step guidance1
Understand that soil particles play a crucial role in plant nutrition by holding onto essential nutrients.
Recognize that soil particles are often charged, which allows them to attract and hold onto ions, such as nutrients needed by plants.
Consider the role of cation exchange capacity (CEC) in soil, which is the ability of soil particles to hold and exchange positively charged ions (cations) like calcium, magnesium, and potassium.
Acknowledge that these charged particles help retain nutrients in the soil, making them available for plant uptake, which is essential for plant growth and health.
Conclude that the correct answer is that soil particles are charged and hold ions needed by plants, facilitating nutrient availability.
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