Question

An adaptation to an arid environment is

• A. A short loop of Henle, which allows more filtrate to be removed from the blood
• B. A short loop of Henle, which allows less water to be removed from the filtrate
• C. A long loop of Henle, which allows more filtrate to be removed from the blood
• D. A long loop of Henle, which allows more water to be removed from the filtrate
• E. A long loop of Henle, which allows less filtrate to be removed from the blood

Answer 1

The correct option is D A long loop of Henle, which allows more water to be removed from the filtrate

Arid environment limits to water availability and organisms exhibit adaptation to preserve more and more water. The loop of Henle consists of a descending limb and an ascending limb which serve to reabsorb most of the water from the filtrate and make the urine concentrated. Thus, to restore most of the water, the animals in the arid environment have long loop of Henle. Thus, the correct answer is D.