Question:
Which among the following is primarily a cellulolytic bacterium in the rumen?
Which among the following is primarily a cellulolytic bacterium in the rumen?
Show Hint
The three major "classic" cellulolytic bacterial species in the rumen to remember are:
1. Fibrobacter succinogenes
2. Ruminococcus albus
3. Ruminococcus flavefaciens
1. Fibrobacter succinogenes
2. Ruminococcus albus
3. Ruminococcus flavefaciens
Updated On: Jul 8, 2026
- Oxalobacter formigenes
- Fibrobacter succinogenes
- Succinomonas amylolytica
- Metanobacterium ruminantium
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Verified By Collegedunia
The Correct Option is B
Solution and Explanation
Step 1: Understanding the Concept:
Rumen microbes are categorized based on their primary metabolic function and the substrates they ferment (such as cellulose, starch, protein, or lipids).
Step 3: Detailed Explanation:
Let us analyze the role of each bacterium:
1. Oxalobacter formigenes: A specialized anaerobic bacterium that degrades oxalate in the gut, helping to prevent kidney stone formation.
2. Fibrobacter succinogenes: One of the most abundant and active cellulolytic (fiber-digesting) bacterial species in the rumen, highly efficient at degrading crystalline cellulose.
3. Succinomonas amylolytica: A rumen bacterium that primarily ferments starch (amylolytic) rather than cellulose.
4. Metanobacterium ruminantium (now Methanobrevibacter ruminantium): An archaeon involved in methanogenesis, utilizing hydrogen and carbon dioxide to produce methane, not a cellulolytic bacterium.
Thus, Fibrobacter succinogenes is primarily a cellulolytic bacterium.
Step 4: Final Answer
The correct option is (B).
Rumen microbes are categorized based on their primary metabolic function and the substrates they ferment (such as cellulose, starch, protein, or lipids).
Step 3: Detailed Explanation:
Let us analyze the role of each bacterium:
1. Oxalobacter formigenes: A specialized anaerobic bacterium that degrades oxalate in the gut, helping to prevent kidney stone formation.
2. Fibrobacter succinogenes: One of the most abundant and active cellulolytic (fiber-digesting) bacterial species in the rumen, highly efficient at degrading crystalline cellulose.
3. Succinomonas amylolytica: A rumen bacterium that primarily ferments starch (amylolytic) rather than cellulose.
4. Metanobacterium ruminantium (now Methanobrevibacter ruminantium): An archaeon involved in methanogenesis, utilizing hydrogen and carbon dioxide to produce methane, not a cellulolytic bacterium.
Thus, Fibrobacter succinogenes is primarily a cellulolytic bacterium.
Step 4: Final Answer
The correct option is (B).
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