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Select the mismatch :...

Select the mismatch :

A

Frankia - Alnus

B

Rhodospirillum - Mycorrhiza

C

Anabaena - Nitrogen fixed

D

Rhizobium - Alfalfa

Text Solution

AI Generated Solution

The correct Answer is:
To solve the question "Select the mismatch," we need to analyze each option provided and determine which one does not correctly match the terms or concepts associated with them. ### Step-by-Step Solution: 1. **Identify the Options:** - Option A: Frankia - Nitrogen fixer - Option B: Rhodospirillum - Mycorrhizae - Option C: Azolla - Nitrogen fixed - Option D: Rhizobium - Alfalfa 2. **Analyze Option A: Frankia** - Frankia is a genus of bacteria known for its ability to fix nitrogen. It forms symbiotic relationships with certain plants, particularly actinorhizal plants. This option is correctly matched. 3. **Analyze Option B: Rhodospirillum - Mycorrhizae** - Rhodospirillum is a genus of bacteria that is known to be an anaerobic nitrogen fixer. Mycorrhizae, on the other hand, refers to a symbiotic association between fungi and the roots of higher plants. Since Rhodospirillum does not form a mycorrhizal relationship, this option is a mismatch. 4. **Analyze Option C: Azolla - Nitrogen fixed** - Azolla is a water fern that has a symbiotic relationship with nitrogen-fixing cyanobacteria (Anabaena). This relationship allows Azolla to fix nitrogen, making this option correctly matched. 5. **Analyze Option D: Rhizobium - Alfalfa** - Rhizobium is a genus of bacteria that forms symbiotic relationships with legumes, including alfalfa, to fix nitrogen. This option is also correctly matched. 6. **Conclusion:** - Based on the analysis, the mismatch is found in **Option B: Rhodospirillum - Mycorrhizae**. Rhodospirillum is a free-living nitrogen fixer and does not form mycorrhizal associations. ### Final Answer: The mismatch is **Option B: Rhodospirillum - Mycorrhizae**.
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