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Which of the following is a flowering plant with nodules containing filamentous nitrogen-fixing micro-organism?

1. Crotalaria juncea
2. Cycas revoluta
3. Cicer arietinum
4. Casuarina equisetifolia

Correct answer: Casuarina equisetifolia

Solution

Casuarina equisetifolia is a flowering plant whose root nodules contain filamentous nitrogen-fixing microorganisms, typically Frankia. This symbiosis allows it to fix atmospheric nitrogen, unlike the gymnosperm Cycas or the leguminous Cicer and Crotalaria.

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