- Home
- Standard 12
- Biology
Consider the following four statements $(1-4)$ about certain desert animals such as kangaroo rat.
$(1)$ They have dark colour and high rate of reproduction and excrete solid urine.
$(2)$ They do not drink water, breathe at a slow rate to conserve water and have their body covered with thick hairs.
$(3)$ They feed on dry seeds and do not require drinking water.
$(4)$ They excrete very concentrated urine and do not use water to regulate body temperature.
Which two of the above statements for such animals are true ?
$3$ and $1$
$1$ and $2$
$3$ and $4$
$2 $ and $3$
Solution
(c) : Kangaroo rat (Dipodomys merriami) feeds on dry seeds. It seldom drinks water. The requirement of water is met by food $(10\%)$ and metabolic water $(90\%)$. Water loss is prevented by living in burrows during the day, concentration of urine and solidification of faeces. It has a thick coat to minimise evaporative desiccation.
