As roots penetrate the soil, their cells release _____ or ____
ions to be able to absorb positively charged ions bound to the
surface of the soil (clay) particles.
a. CO2; Ca2+
b. O2; H
c. H2O; Ca2+
d. CO2; HIn general, roots of plants can reach into the
___ layer of the soil profile.
a. A b. B
c. C
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