Select the mismatch

Options

A. a-Frankia-Alnus
B. b-Rhodosphirillum-Mycorrhiza
C. c-Anabaena-Nitrogen fixer
D. d-Rhizobium-Alfa-alfa

Answer

B

Explanation

Among the given options, only option (b) is mismatched. Rhodospirillum is a free living nitrogen fixing bacteria. Mycorrhiza is the symbiotic association of a fungus with the root of a higher plant.