Which of the following is a flowering plant with nodules containing filamentous nitrogen-fixing microorganism?
(1) Casuarina equisetifolia
(2) Crotolaria juncea
(3) Cycas revoluta
(4) Cicer arietinum
(1) The casuarina tree has nitrogen fixing root nodules that harbor a filamentous Actinomycete like nitrogen fixing organism called Frankia.