Leguminous plants, e.g Mucana, are usually planted in cultivated farmlands because they
A. enrich the soil with phoshates B. provide animals with food C. enrich the soil with organic nitrogen D. protect the soil from being over-heated E. protect the micro organisms in the soil
Correct Answer: C
Explanation
The correct answer is C: enrich the soil with organic nitrogen.
Explanation: Leguminous plants like Mucuna are planted in cultivated farmlands because they have a symbiotic relationship with nitrogen-fixing bacteria (Rhizobium) in their root nodules. These bacteria convert atmospheric nitrogen into a form that plants can use, enriching the soil with nitrogen. This process helps improve soil fertility, especially after the crops are harvested, benefiting subsequent crops. Nitrogen is a critical nutrient for plant growth, making leguminous plants valuable for sustainable farming practices.
