Which of the following is a flowering plant with nodules containing filamentous nitrogen-fixing microorganism?
Cicer arietinum
Casuarina equisetifolia
Crotalaria juncea
Cycas revolute
A
Casuarina equisetifolia
B
Crotalaria juncea
C
Cicer arietinum
D
Cycas revolute
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Solution
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Answer :
i) All the casuarinas are nitrogen-fixing.
ii) Casuarinas support an actinorhiza symbiont in their root nodules, as opposes to the rhizobium symbiont found in the root nodules of leguminous trees that fix N2.
Therefore correct answer is option B.Casuarina equisetifolia.
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