Question:
Which of the following system is absent in Nematodes?
Which of the following system is absent in Nematodes?
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Nematodes lack both a circulatory and a respiratory system. Respiration and internal transport happen through simple diffusion in the pseudocoelomic fluid.
Updated On: Aug 18, 2026
- Excretory system
- Circulatory system
- Nervous system
- Reproductive system
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The Correct Option is B
Solution and Explanation
Step 1: Understanding the Concept:
Nematodes (roundworms) are pseudocoelomate, triploblastic, bilaterally symmetrical organisms with simplified body plans.
Step 2: Detailed Explanation:
Nematodes possess well-developed nervous, reproductive, digestive, and excretory systems.
However, they completely lack a circulatory system (as well as a respiratory system).
The transport of nutrients, gases, and metabolic wastes is achieved through the movement of the pseudocoelomic fluid, which bathes the internal organs.
Step 3: Final Answer:
Thus, the circulatory system is absent in Nematodes, which corresponds to option (B).
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