How many of the following statements is/are correct?
(1) Both Rhizobium and Frankia are free-living in soil and can fix only under symbiotic condition.
(2) Root nodules can be best observed before flowering
(3) The formation of root nodules takes place as a result of the division of cortical and pericycle cells.
(4) When Rhizobium is free living it is aerobic but when it is symbiont it becomes anaerobic to protect Mo-Fe protein. Options :
(1) 4
(2) 3
(3) 2
(4) 1
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