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Question

The animal that mostly depends on 'Metabolic water' to survive for long periods without drinking water

A
Didelphis
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B
Ornythorhynehus
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C
Macropus
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D
Dipodomys
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Solution

The correct option is B Didelphis
Koala, scientific name Didelphis coola, are hindgut fermenters, such that their digestive retention can last for 100 hours because of the presence of extremely long caecum. Thus, only 10% of the animal's energy is obtained from fermentation. Since, the koala gains a low amount of energy from its diet, its metabolic rate is half that of a typical mammal. The koala passing relatively dry faecal pellets high in undigested fibre and thereby stores water in the caecum.

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