| I. They have dark colour high rate of reproduction and excrete solid urine. |
| II. They do not drink water, breathe at a slow rate to conserve water and have their body covered with thick hairs. |
| III. They feed on dry seeds and do not require drinking water. |
| IV. They excrete very concentrated urine and do not use water to regulate body temperature |
A) III and IV
B) II and III
C) III and I
D) I and II
Correct Answer: A
Solution :
Kangaroo rat is a desert rodent. Its body is covered with hairs. Its urine is more than 20 times concentrated as its plasma. This concentrated waste enables it to live in dry or desert environment, where little water is available for him to drink. Most of its water is metabolically produced from the oxidation of carbohydrates, fats and proteins in the seeds that they eat. The animal remains in cool burrow during day time and the respiratory moisture condensed in nasal passages.
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