Select the mismatch

Options

A. Frankia - Alnus
B. Rhodospirillum - Mycorrhiza
C. Anabaena - Nitrogen fixer
D. Rhizobium - Alfalfa

Answer

B

Explanation

Rhodospirillum is anaerobic, free living nitrogen fixer.
Mycorrhiza is a symbiotic relationship between fungi and roots of higher plants.