Question 29
Nutrient CyclingThe diagram below is the root system of a leguminous plant. Study it and answer the question.
The structures labelled II are associated with
- A.storage of plant nutrients
- B.organic acids
- C.nitrogen-fixing bacteria
- D.putrefying microbes.
Show the answer and explanation
Answer: C (nitrogen-fixing bacteria)
Explanation
Root nodules contain Rhizobium bacteria, which fix nitrogen from the air into compounds the plant can use.