Of the steps below, which would be fourth in the sequence for the formation of a root nodule?
A) Bacteroids are formed.
B) The root produces flavonoids that attract Rhizobium bacteria to the vicinity of the root.
C) Flavonoids trigger transcription of the bacterial nod genes.
D) The plant produces leghemoglobin.
E) Nod factors secreted by the bacteria cause cell division leading to the formation of primary nodule meristem.
Correct Answer:
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