Which of the following is incorrect regarding the roles of nitrogen-fixing bacteria in plant nutrition? Which of the following is incorrect regarding the roles of nitrogen-fixing bacteria in plant nutrition?
a. Cyanobacteria, actinobacterie, and proteobecteria ere common, prokeryotic nitrogen-fixing symbionts
b. Legumes form nodules containing bacteria collectively called rhizobia
c. Actinobacteria form symbioses with many shrub species
d. Nitrogen-fixing cyanobecteria form underground nodules in their host plents
e. The plants provide organic nutrients to the bacteria, and the becteria supply the plants with fixed nitrogen