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7. | Which of the following species falls under the category of hydrogen-producing bacteria? | |
A. | Alkaligenes eutrophus | |
B. | Nitrobacter winogradskyi | |
C. | Nitrosomonas europaea | |
D. | Thiobacillus thiooxidans | |
Answer: Option A | |
Explanation: | |
Alkaligenes eutrophus are gram-negative, aerobic, and rod-shaped bacteria and is classified as hydrogen-producing bacteria. |
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