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Which of the following animals is not a ...

Which of the following animals is not a pair of poikilotherms?

A

Torpedo, Trygon

B

Trygon, panthera

C

Pristis, carcharodon

D

Scoliodon, Trygon

Text Solution

AI Generated Solution

The correct Answer is:
To determine which of the following animals is not a pair of poikilotherms, we need to analyze each option based on their classification as either poikilothermic (cold-blooded) or homeothermic (warm-blooded). 1. **Understanding Poikilotherms and Homeotherms**: - Poikilotherms are animals whose body temperature varies with the ambient temperature. Examples include fishes, amphibians, and reptiles. - Homeotherms maintain a constant body temperature regardless of the environment. This group includes birds and mammals. 2. **Analyzing the Options**: - **Option A: Torpedo and Trigon**: - Torpedo (electric ray) and Trigon (poison ray) are both types of fish. Therefore, both are poikilothermic. - **Option B: Trigon and Panthera**: - Trigon (poison ray) is a fish (poikilothermic), while Panthera (genus that includes lions and tigers) is a mammal (homeothermic). This option contains one poikilotherm and one homeotherm. - **Option C: Carcharodon and Pristis**: - Carcharodon (great white shark) and Pristis (sawfish) are both cartilaginous fishes. Thus, both are poikilothermic. - **Option D: Scoliodon and Trigon**: - Scoliodon (dogfish shark) and Trigon (poison ray) are both fishes, making them both poikilothermic. 3. **Conclusion**: - The only option that contains an animal that is not a poikilotherm is **Option B: Trigon and Panthera**. Panthera is a warm-blooded mammal, while Trigon is a cold-blooded fish. **Final Answer**: Option B (Trigon and Panthera) is the correct answer as it includes one poikilotherm and one homeotherm. ---
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