Previous Year Question

The Kangaroo Rat is a small Rodent Mammal found in the arid and desert regions of North America, capable of surviving under conditions of extremely limited water availability. It primarily belongs to the genus Dipodomys and possesses relatively long hind legs that allow it to leap like a kangaroo. Its distinguishing characteristic is that several species can survive their entire lives without directly drinking water. This ability depends on specialized physiological mechanisms for water production and conservation.

Metabolic Water is a major source of water for the Kangaroo Rat. Its diet consists primarily of Dry Seeds. During Cellular Respiration, the oxidation of carbohydrates and fats present in these seeds produces water along with energy.

The Renal System of the Kangaroo Rat is highly adapted for water conservation. Its kidneys produce Highly Concentrated Urine, minimizing water loss. Its faeces also contain very little water. Specialized Nasal Passages recover some of the water vapour during exhalation. Additionally, it is primarily Nocturnal and spends daytime hours in relatively cool, humid Underground Burrows, reducing water loss through evaporation.

Among the other options, the Camel can survive without drinking water for extended periods under desert conditions, but it still requires water periodically. A camel's Hump stores Fat rather than water. The Giraffe obtains considerable moisture from leaves but drinks water when available. The common Kangaroo is an Australian Marsupial Mammal, whereas the Kangaroo Rat is a North American Rodent. The Kangaroo Rat is remarkable because some species can meet their water requirements without access to external drinking water.