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Question
Choose the odd one among the following with reference to microbes as biofertilizers:
- Ladybird beetles
- Azotobacter
- Azospirillum
- Rhizobium
Odd One Out
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Solution
Ladybird beetles
Explanation:
Azotobacter, Azospirillum, and Rhizobium are all nitrogen-fixing microorganisms used as biofertilizers to improve soil fertility.
Ladybird beetles are insect predators (they feed on aphids and other pests) and are used as biocontrol agents, not as biofertilizers.
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