Which organism is a nitrogen-?xing symbiont of legumes?
A) Rhizobium
B) Pseudomonas
C) Nitrobacter
D) Clostridium
Correct Answer:
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Q27: The advantage of nitrogen fixation to the
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Q30: Toxic substances accumulate through natural trophic flow
Q31: Which trophic level forms the base of
Q32: Which of the following is a source
Q33: Organisms whose sole source of carbon for
Q34: Chemical elements needed in trace amounts for
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