The diagram below models part of the nitrogen cycle. Use the diagram to answer any questions that follow. What happens to the nitrogen at W? a Its usable form is bonded with other molecules in the atmosphere. b Its unusable form is converted into a form that is usable by bacteria in the soil. c Its usable form is inhaled and turned into proteins by the rabbit. d Its unusable form is directly transferred up the tree roots.
Based on the given diagram, the correct answer is b) Its unusable form is converted into a form that is usable by bacteria in the soil. At point W, nitrogen from the atmosphere is fixed by nitrogen-fixing bacteria in the soil, converting it into a usable form for plants.
