Select the mismatch. Rhizobium - Alfalfa, Rhodospirillum - Mycorrhiza, Frankia - Alnus, Anabaena - Nitrogen fertilizer

Mycorrhiza is the association of the fungus with the root of the vascular host plant. It increases the water and nutrition absorption capacity of the plant. Rhodospirillum - mycorrhiza (the association of the fungus with the root of the vascular host plant). It increases the water and nutrition absorption capacity of the plant. Rhodospirillum is a facultative anaerobe. It is a nitrogen fixer which helps in the conversion of atmospheric nitrogen to ammonia. It is not associated with roots of the vascular plant as mycorrhiza. So, the correct answer is option D.