Question:
Parenchymal circulation is found in ________
Parenchymal circulation is found in ________
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No circulatory system → diffusion through parenchyma (seen in flatworms).
Updated On: May 4, 2026
- earthworm
- flatworms
- roundworm
- ringworm
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Verified By Collegedunia
The Correct Option is B
Solution and Explanation
Concept:
Parenchymal circulation refers to the distribution of nutrients and gases through body tissues (parenchyma) in organisms that lack a specialized circulatory system.
Step 1: Understand organisms without circulatory system. Flatworms (Phylum Platyhelminthes):
• Lack a circulatory system
• Have a highly branched body
• Use diffusion through parenchyma for transport
Step 2: Analyze other options.
• (A) Earthworm → Closed circulatory system $\times$
• (B) Flatworms → Parenchymal circulation \checkmark
• (C) Roundworm → Pseudocoelomic fluid helps transport $\times$
• (D) Ringworm → Fungal infection, not animal $\times$
Step 3: Conclusion. \[ \text{Parenchymal circulation occurs in flatworms} \]
Parenchymal circulation refers to the distribution of nutrients and gases through body tissues (parenchyma) in organisms that lack a specialized circulatory system.
Step 1: Understand organisms without circulatory system. Flatworms (Phylum Platyhelminthes):
• Lack a circulatory system
• Have a highly branched body
• Use diffusion through parenchyma for transport
Step 2: Analyze other options.
• (A) Earthworm → Closed circulatory system $\times$
• (B) Flatworms → Parenchymal circulation \checkmark
• (C) Roundworm → Pseudocoelomic fluid helps transport $\times$
• (D) Ringworm → Fungal infection, not animal $\times$
Step 3: Conclusion. \[ \text{Parenchymal circulation occurs in flatworms} \]
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