Question

A terrestrial animal must be able to

• A. Actively pump salts out through the skin
• B. Excrete large amount of salts in urine
• C. Excrete large amounts of water in urine
• D. Conserve water

Answer 1

Answer: (D)

Conserve water

Animals that excrete excess nitrogen in the form of urea are ureotelic. Terrestrial animals cannot use water freely for excretion because of less availability in the environment, so ammonia is converted into a less toxic and easily soluble product, urea. In mammals and semi-terrestrial adult amphibians, urea is a major nitrogenous excretory product, therefore these animals are called ureotelic.

So, the correct answer is option D.