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a
Nitrosomonas and Nitrosococcus obtain energy by oxidizing nitrites to nitrates.
b
Streptomycin is produced by Thermoplasma
c
Citrus exocortis is caused by Xanthomonas citri
d
Clostridium botulinum cause food poisoning
answer is D.
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Detailed Solution
Clostridium botulinum cause food poisoning or botulism by secreting the toxic chemical called botulin.Nitrosomonas and Nitrosococcus obtain energy by oxidising ammonia to nitrite.Streptomycin is produced by Streptomyces which is an actinomycetesCitrus exocortis is caused by viroid.