Question Detail
Question
Differences in the scales of fishes and reptiles lies in their being:
Correct Answer
Option B is the correct answer.
Detailed Explanation
Fish scales (placoid, ganoid, cycloid, ctenoid) are derived from the dermis (mesodermal origin) and are covered by epidermis, making them wet due to mucus. Reptile scales (including snakes and lizards) are epidermal derivatives (keratinized) and are dry, providing protection against desiccation. The key difference is that fish scales are dermal (not endodermal) and wet, while reptile scales are epidermal and dry.
Hint
Consider the origin (germ layer) and the presence or absence of moisture in these two types of scales.