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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Hirudinaria (leech) has a crop and stomach in its alimentary canal in this sequence.
Updated On: Oct 17, 2026
- Pheretima
- Hirudinaria
- Nereis
- Ascaris
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The Correct Option is B
Solution and Explanation
Step 1: Understanding the Question:
• We must identify the animal whose alimentary canal is differentiated into mouth, buccal cavity, pharynx, oesophagus, crop, stomach, intestine, rectum and anus.
Step 2: Detailed Explanation:
• Hirudinaria (the leech) has this complete, regionally differentiated canal including a large crop (with caeca) and stomach.
• Pheretima has a gizzard and no such crop-stomach arrangement, Nereis has a pharynx with jaws and Ascaris has a simple straight gut.
Step 3: Final Answer:
The correct option is (B) Hirudinaria.
• We must identify the animal whose alimentary canal is differentiated into mouth, buccal cavity, pharynx, oesophagus, crop, stomach, intestine, rectum and anus.
Step 2: Detailed Explanation:
• Hirudinaria (the leech) has this complete, regionally differentiated canal including a large crop (with caeca) and stomach.
• Pheretima has a gizzard and no such crop-stomach arrangement, Nereis has a pharynx with jaws and Ascaris has a simple straight gut.
Step 3: Final Answer:
The correct option is (B) Hirudinaria.
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