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Question

Which of the following organism may respire in the absence of oxygen?


A
Azotobacter
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B
Clostridium
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C
Rhizobium
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D
Lactobacillus
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Solution

The correct option is D Lactobacillus
  • Azotobacter and rhizobium both are aerobic and nitrogen-fixing bacteria. They can not survive in anaerobic condition. 
  • Clostridium is obligate anaerobic that means it killed by normal atmospheric concentration of oxygen.
  • Lactobacillus is facultative anaerobic bacteria, which can grow in both the presence or absence of oxygen.
So lactobacillus can respire in the absence of oxygen also. 

Hence the correct answer is option D.

Biology

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