Soybeans Will Have Several Hundred Rhizobium Nodules

question 78

Multiple Choice

Soybeans will have several hundred Rhizobium nodules.A study in Minnesota found that soybeans grown without P₂O₅ fertilizer produced 23.0 bushels per acre,while adding 23 lbs of P₂O₅ per acre gave a yield of 37 bushels per acre.What is the best explanation for this observation?

• A)Rhizobium cannot produce PO₄,so you need to add fertilizer that contains P.
• B)Rhizobium produces NH₄⁺,so you don't need fertilizer that contains N.
• C)Rhizobium produces PO₄ and NH₄⁺,so you don't need any fertilizer.
• D)Rhizobium produces PO₄,so you don't need P-containing fertilizer.
• E)Rhizobium cannot produce NH₄⁺,so you need to add fertilizer that contains N.

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