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A prokaryotic autotrophic nitrogen fixing symbiont is found in:

1. Alnus
2. Cycas
3. Cicer
4. Pisum

Correct answer: Alnus

Solution

Alnus forms root nodules with Frankia, a prokaryotic actinomycete that fixes atmospheric nitrogen. The other options are legumes or gymnosperms with different symbiotic associations, not the classic Frankia-Alnus partnership.

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