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Fishes with swim bladder without direct ...

Fishes with swim bladder without direct communication with exterior and where there is little separation of secretory and absorbent parts are

A

Physostomes

B

Physoclists

C

Euphysoclists

D

Paraphysoclists

Text Solution

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The correct Answer is:
To solve the question regarding fishes with swim bladders that do not have direct communication with the exterior and exhibit little separation between secretory and absorbent parts, we can analyze the options provided: ### Step-by-Step Solution: 1. **Understanding Swim Bladders**: - Swim bladders are gas-filled organs that help fish maintain buoyancy. They can be categorized based on their anatomical features and connections to the digestive system. 2. **Analyzing the Options**: - **Option A: Physostomes**: - Physostomes are fish that possess a swim bladder connected to the digestive tract via a pneumatic duct. This means they have direct communication with the exterior, making this option incorrect. - **Option B: Physoclists**: - Physoclists are fish that lack a pneumatic duct, meaning their swim bladder does not connect to the digestive system. This results in no direct communication with the exterior. Additionally, there is little separation between the secretory and absorbent parts of the swim bladder, making this option a strong candidate for the correct answer. - **Option C: Euphysoclysts**: - Euphysoclysts have a more complex structure where a posterior chamber is formed, leading to a clear separation between the secretory and absorbent parts. Therefore, this option does not fit the criteria of little separation. - **Option D: Para-physoclysts**: - Para-physoclysts also show some separation between the secretory and absorbent parts due to bending in the absorbent path. Thus, this option does not meet the requirement of little separation. 3. **Conclusion**: - Based on the analysis, the only option that fits the criteria of having a swim bladder without direct communication with the exterior and showing little separation between secretory and absorbent parts is **Option B: Physoclists**. ### Final Answer: The correct answer is **Option B: Physoclists**. ---
To solve the question regarding fishes with swim bladders that do not have direct communication with the exterior and exhibit little separation between secretory and absorbent parts, we can analyze the options provided: ### Step-by-Step Solution: 1. **Understanding Swim Bladders**: - Swim bladders are gas-filled organs that help fish maintain buoyancy. They can be categorized based on their anatomical features and connections to the digestive system. 2. **Analyzing the Options**: ...
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