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Question

Which of the following options doesn’t have a sensory organ with respect to Rana tigrina?

A
Sensory papillae and taste buds
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B
Eyes and nasal epithelium
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C
Tympanum with internal ears
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D
Cloaca and external ear
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Solution

The correct option is D Cloaca and external ear
Frogs have five different types of sense organs, namely organs of touch (sensory papillae), taste (taste buds), smell (nasal epithelium), vision (eyes) and hearing (tympanum with internal ears).
External ear is absent in frogs and only tympanum can be seen externally. It is located just behind the eye of Rana tigrina. It does not process sound waves; it simply transmits them to the inner parts of the amphibian's ear.
Cloaca is a small median chamber that is used to pass faecal matter, urine and sperm to the exterior. It is not a part of the different types of sense organs in frog.

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