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Tooth-shaped scales are...

Tooth-shaped scales are

A

Cycloid

B

Ctenoid

C

Ganoid

D

Placoid

Text Solution

AI Generated Solution

The correct Answer is:
**Step-by-Step Solution:** 1. **Understanding the Question**: The question asks about the type of scales that are tooth-shaped. We need to identify which of the given options fits this description. 2. **Analyzing the Options**: - **Cycloid Scales**: These scales are thin and flexible, typically circular in shape. They do not resemble teeth, so they are not the correct answer. - **Tenoid Scales**: Similar to cycloid scales, tinoid scales are also circular in shape. They do not have a tooth-like appearance, making this option incorrect as well. - **Ganoid Scales**: Ganoid scales are heavier and made of an enamel-like structure. They come in various shapes but do not specifically have a tooth-like structure. Therefore, this option is also incorrect. - **Placoid Scales**: These scales are indeed tooth-shaped. They have a basal plate embedded in the skin of the fish, with a spine-like structure protruding from the epidermis. This description matches the requirement of being tooth-shaped. 3. **Conclusion**: After analyzing all the options, we conclude that the correct answer is **placoid scales**, which are tooth-shaped scales found on the bodies of certain fishes. **Final Answer**: Placoid ---
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