Which are true about the following statements about kangaroo rats
(a) They have dark colour, high rate of reproduction and excrete solide urine
(b) They do not drink water, breathe at slow rate, and have their body covered with thick hair
(c) The feed on dry seeds and do not require drinking water
(d) They excrete very concentrated urine and do not use water to regulate body temperature

Options

A. (iii) and (i)
B. (i) and (ii)
C. (iii) and (iv)
D. (ii) and (iii)

Answer

To determine which statements about kangaroo rats are true, let's analyze each statement step by step:

### Step 1: Analyze Statement (a)
**Statement (a):** They have dark colour, high rate of reproduction and excrete solid urine.
- **Analysis:** Kangaroo rats are typically sandy-colored, not dark. They do have a high rate of reproduction, but the key point here is that they excrete concentrated urine (which is solid waste) to conserve water. Therefore, this statement is **partially true** but overall **incorrect** due to the color description.

### Step 2: Analyze Statement (b)
**Statement (b):** They do not drink water, breathe at a slow rate, and have their body covered with thick hair.
- **Analysis:** It is true that kangaroo rats do not drink water; they obtain moisture from the seeds they eat. However, they do not necessarily breathe at a slow rate, and their bodies are covered with fur rather than thick hair. This statement is **partially true** but overall **incorrect** due to the breathing rate and hair description.

### Step 3: Analyze Statement (c)
**Statement (c):** They feed on dry seeds and do not require drinking water.
- **Analysis:** This statement is true. Kangaroo rats primarily feed on dry seeds and can meet their water needs through metabolic processes associated with the seeds. Therefore, this statement is **true**.

### Step 4: Analyze Statement (d)
**Statement (d):** They excrete very concentrated urine and do not use water to regulate body temperature.
- **Analysis:** This statement is true. Kangaroo rats excrete very concentrated urine to conserve water, and they do not rely on water for thermoregulation. Therefore, this statement is **true**.

### Conclusion
Based on the analysis:
- **True Statements:** (c) and (d)
- **False Statements:** (a) and (b)

Thus, the correct answer is that statements (c) and (d) are true about kangaroo rats.

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