Question:
The differentiation of alimentary canal into mouth, buccal cavity, pharynx, oesophagus, crop, stomach, intestine, rectum and anus describes which one of the following?
The differentiation of alimentary canal into mouth, buccal cavity, pharynx, oesophagus, crop, stomach, intestine, rectum and anus describes which one of the following?
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Earthworms (Pheretima) have âCropsâ to store and âGizzards/Stomachâ to grind soil.
Updated On: May 28, 2026
- Pheretima
- Hirudinaria
- Nereis
- Ascaris
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The Correct Option is A
Solution and Explanation
Step 1: Concept
Different invertebrates have varying levels of complexity in their digestive systems.
Step 2: Meaning
The list (mouth $\to$ crop $\to$ stomach $\to$ intestine) describes a highly specialized digestive tract.
Step 3: Analysis
Pheretima (Earthworm) has this exact sequence. Ascaris has a much simpler tube system. Hirudinaria (leech) has different overall morphology.
Step 4: Conclusion
The described anatomy is characteristic of Pheretima posthuma.
Final Answer: (1)
Different invertebrates have varying levels of complexity in their digestive systems.
Step 2: Meaning
The list (mouth $\to$ crop $\to$ stomach $\to$ intestine) describes a highly specialized digestive tract.
Step 3: Analysis
Pheretima (Earthworm) has this exact sequence. Ascaris has a much simpler tube system. Hirudinaria (leech) has different overall morphology.
Step 4: Conclusion
The described anatomy is characteristic of Pheretima posthuma.
Final Answer: (1)
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