The three primary plant nutrients are
A) phosphorus, nitrogen and calcium.
B) phosphorus, potassium and nitrogen.
C) magnesium, phosphorus and nitrogen.
D) calcium, potassium and magnesium.
Correct Answer:
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Q11: Uptake of potassium ions from the soil
Q12: The usual chemical form of potassium in
Q13: Nitrogen must be "fixed" to convert it
Q14: Green plants are the ultimate source of
Q15: A 5-15-20 fertilizer has what percentage of
Q17: The conversion of phosphate rock and bone
Q18: DDT was NOT effective against
A)foxes.
B)grapevine pests.
C)lice.
D)mosquitos.
Q19: Sulfur is needed by plants for
A)nitrogen fixation.
B)nucleic
Q20: DDT is concentrated in living organisms because
Q21: Identify the compound that is NOT a
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