Question

The canal system is a characteristic feature of

• A. echinoderms
• B. sponges
• C. helminthes
• D. coelenterates.

Answer 1

The Correct Option is B

The given question is about identifying the organism group that features a canal system. Let's analyze the options one by one:

The Canal System: The canal system is a network of water channels present in certain aquatic organisms that helps in circulating water throughout the body. It plays a critical role in functions such as feeding, respiration, and excretion.

1. Echinoderms: Echinoderms, such as starfish and sea urchins, do not have a canal system as described here. They have a water vascular system but it is different from the canal system found in sponges.
2. Sponges: Sponges, also known as Porifera, have a well-developed canal system. It includes structures like Ostia (small pores), Spongocoel (central cavity), and Oscula (large opening). The water flows through these canals, facilitating feeding and respiration. Thus, sponges are characterized by this canal system, which is essential for their survival.
3. Helminthes: Helminthes are parasitic worms and do not possess a canal system as described. Their body structure and physiological requirements differ greatly from sponges.
4. Coelenterates: Coelenterates, also known as Cnidaria (e.g., jellyfish, corals), possess a body cavity known as the gastrovascular cavity, not a canal system like that of sponges.

Hence, the canal system is mainly a characteristic feature of sponges.

Conclusion: The correct answer is sponges, as they uniquely possess the canal system used for water circulation within their bodies.