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In which of the following classes, animals lack scales and have mucous glands in the skin?

In which of the following classes, animals lack scales and have mucous glands in the skin? Correct Answer Amphibian

The correct answer is Amphibian.

  • Amphibian classes, animals lack scales and have mucous glands in the skin.

Key Points

  • Amphibians are cold-blooded vertebrates (vertebrates have backbones) that don’t have scales. They live part of their lives in water and part on land.
  • These animals are born with gills, and while some outgrow them as they transform into adults, others retain them for their entire lives.
  • Amphibians are the most threatened class of animals in nature. They are extremely susceptible to environmental threats because of their porous eggs and semipermeable skin. 

Additional Information

Important Points

Name Details
Reptiles
  • Reptiles, as most commonly defined, are the animals in the class Reptilia, a paraphyletic grouping comprising all amniotes except synapsids and Aves.
  • Reptiles are air-breathing, cold-blooded vertebrates that have scaly bodies rather than hair or feathers.
Fish
  • Fishes are a group of animals that are completely aquatic vertebrates that have gills, scales, swim bladders to float, most produce eggs, and are ectothermic.
  • Sharks, stingrays, skates, eels, puffers, seahorses, clownfish are all examples of fishes.
Aves
  • Birds are a group of warm-blooded vertebrates constituting the class Aves.
  • Birds are vertebrates with feathers, modified for flight and for active metabolism.
  • Birds are a monophyletic lineage, evolved once from a common ancestor, and all birds are related through that common origin.

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