Which of the following can NOT be inferred from the passage?

This is a 'NOT' question, so we need to eliminate answer choices that are reasonable inferences based on details from the passage. Answer choices A 1-month-old alfalfa plant will have more bacteria than a 5-month-old plant and A 3-month-old alfalfa plant will have more bacteria than a one-year-old plant can be inferred from the mention that young plants still display the same “peculiarity.” In addition, since these answer choices seem to suggest the same thing, namely that younger alfalfa plants will have more bacteria than older alfalfa plants, they cannot both be invalid inferences, so you should eliminate them. Answer choice Bacteria is located inside the root nodules. can be eliminated because the author describes the nodules as the “home” of the bacteria. Finally, nothing in the passage allows us to infer that “a soil without lime will not grow bacteria”.