How Do Nitrogen-Fixing Microbes First Become Symbiotic with Their Plants

question 82

Multiple Choice

How do nitrogen-fixing microbes first become symbiotic with their plants?

• A) They are carried in the seed.
• B) They are attracted by chemicals released by the root.
• C) They move in via openings in the plant cell walls.
• D) They move into the vascular system and multiply.
• E) They enter root nodules previously produced by the plant.

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