Question:
Identify Non-leguminous Nitrogen Fixing Tree species:
Identify Non-leguminous Nitrogen Fixing Tree species:
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The two major symbiotic nitrogen-fixing systems in trees are:
1. Legume + Rhizobium (e.g., Leucae, Acacia).
2. Non-legume (Actinorhizal) + Frankia (e.g., Casuari, Alnus).
1. Legume + Rhizobium (e.g., Leucae, Acacia).
2. Non-legume (Actinorhizal) + Frankia (e.g., Casuari, Alnus).
Updated On: Jul 28, 2026
- Leucae
- Casuari
- Erythri
- Prosopis
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The Correct Option is B
Solution and Explanation
Step 1: Understanding the Concept:
Nitrogen-fixing trees play an important role in agroforestry by improving soil fertility.
While most nitrogen-fixing trees belong to the Fabaceae (legume) family, certain non-leguminous plants can also fix atmospheric nitrogen through symbioses with actinomycetes.
Step 2: Detailed Explation:
Let us classify the nitrogen-fixing mechanisms of the given tree genera:
• Leucae, Erythri, and Prosopis: These are leguminous trees belonging to the Fabaceae family. They fix atmospheric nitrogen through a symbiotic relationship with Rhizobium bacteria in their root nodules.
• Casuari: This genus belongs to the family Casuariceae, which are non-leguminous angiosperms. They fix atmospheric nitrogen through a symbiotic relationship with the actinomycete Frankia. These associations are called actinorhizal symbioses, and the plants are referred to as actinorhizal plants.
Therefore, Casuari is a non-leguminous nitrogen-fixing tree species.
Step 3: Fil Answer:
The correct option is (B).
Nitrogen-fixing trees play an important role in agroforestry by improving soil fertility.
While most nitrogen-fixing trees belong to the Fabaceae (legume) family, certain non-leguminous plants can also fix atmospheric nitrogen through symbioses with actinomycetes.
Step 2: Detailed Explation:
Let us classify the nitrogen-fixing mechanisms of the given tree genera:
• Leucae, Erythri, and Prosopis: These are leguminous trees belonging to the Fabaceae family. They fix atmospheric nitrogen through a symbiotic relationship with Rhizobium bacteria in their root nodules.
• Casuari: This genus belongs to the family Casuariceae, which are non-leguminous angiosperms. They fix atmospheric nitrogen through a symbiotic relationship with the actinomycete Frankia. These associations are called actinorhizal symbioses, and the plants are referred to as actinorhizal plants.
Therefore, Casuari is a non-leguminous nitrogen-fixing tree species.
Step 3: Fil Answer:
The correct option is (B).
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