A) Escherichia and Agrobacterium
B) Nitrobacter and Azotobacter
C) Rhizobium and Diplococcus
D) Nitrosomonas and Klebsiella
Correct Answer: A
Solution :Escherichia and Agrobacterium are both used as vectors in genetic engineering. Nitrobacter converts nitrites to nitrates. Azotobacter is a free living nitrogen fixing bacteria. Nitrosomonas converts ammonia to nitrates. Rhizobium is a symbiotic nitrogen fixing bacteria living in the root nodules of leguminous plants Diplococcus pneumonia causes pneumonia. Hence, the correct option is [a].
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