Your professor brings in a soybean plant,having pulled it up roots and all from a nearby farm field.Small growths on the roots are shown to have bacteria,which the professor explains can "fix" nitrogen into a usable form for the plant.The growths are called

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The growths on the roots of the soybean plant are known as nodules, which are formed by a symbiotic relationship between the plant and nitrogen-fixing bacteria. The bacteria live within the nodules and convert atmospheric nitrogen into a form that the plant can use for growth and development. Sieve tubes, root hairs, nodes, and internodes are all different structures found in plants, but they do not play a role in nitrogen fixation.

Your Professor Brings in a Soybean Plant,having Pulled It Up