The characteristics of Class Reptilia are:
Correct answer: D. Body covered with dry and cornified skin, scales over the body are epidermal, they do not have external ears
- A. Body covered with moist skin which is devoid of scales, the ear is represented by a tympanum, alimentary canal, urinary and reproductive tracts open into a common cloaca
- B. Fresh water animals with bony endoskeleton, airbladder to regulate buoyancy
- C. Marine animals with cartilaginous endoskeleton, body covered with placoid scales
- D. Body covered with dry and cornified skin, scales over the body are epidermal, they do not have external ears
Explanation
Reptiles represent the first class of vertebrates fully adapted for life in dry places on land. The characters of reptiles are in fact a combination of characters that are found in fish and amphibians on one hand and birds and mammals on the other. Their exoskeleton is of horny epidermal scales, shields, plates and scutes. The skin is dry, cornified and devoid of glands. Reptiles lack external ears and have immovable eyelids.
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About Kingdom Animalia
Animals are multicellular, heterotrophic eukaryotes whose cells lack cell walls and chloroplasts, with specialised tissues in most groups. Coverage includes body symmetry, tissue layers, coelom, segmentation and levels of organisation, plus major phyla such as Porifera, Cnidaria, Platyhelminthes, Annelida, Arthropoda, Mollusca and Chordata.
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