Multiple Choice
The following questions refer to the figure above illustrating soil horizons.NOTE: The labels are not the actual names of the soil horizons.
-Which of the following is true concerning root nodules?
A) They may kill a plant.
B) They are produced by a fungus.
C) They remove nitrogen compounds from the plant.
D) They convert the harmful ammonia that plant cells produce into gaseous nitrogen.
E) None of these are true.
Correct Answer:
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