Discussion
Which of the following is NOT a nitrogen fixing tree species?
Answer: B
Eucalyptus tereticornis is not a nitrogen-fixing tree: it belongs to the myrtle family and has no root nodules. Acacia, Cassia and Saraca are legumes, and the key treats them as nitrogen-fixing.
I could not confirm from a source that Cassia siamea and Saraca indica fix nitrogen, since nodulation is rare in the caesalpinioid legumes, but Eucalyptus is clearly not a nitrogen fixer, so the key's answer holds.
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