Question

In: Biology

1. An animal that lives in a desert is MOST likely to have which type of...

1. An animal that lives in a desert is MOST likely to have which type of nitrogenous waste and why?

A. ammonia because it requires little water

B. urea because it is nontoxic

C. uric acid because it can be secreted as a paste

D. ammonium because it is soluble in water

2. Which excretory organ is the MOST complex?

A. protonephridium

B. kidney

C. metanephridium

D. Malpighian tubule

3. Why do humans get dehydrated if they only have saltwater available to drink?

A. The saltwater is hypoosmotic to their cells and their bodies need to gain more water for balance.

B. The saltwater is hyperosmotic to their cells and their bodies need to gain more water for balance.

C. The saltwater is hypoosmotic to their cells and their bodies need to lose more water for balance.

D. The saltwater is hyperosmotic to their cells and their bodies need to lose more water for balance.

Solutions

Expert Solution

1. The correct answer is option C - uric acid because it can be secreted as a paste

Explanation: In desert, retention of water in body is of prime importance. So animals try their best to conserve water in the body. This is why they absorb water at the most from their excretory products and expel it as a paste.

2.  The correct answer is option B- Kidney

Explanation: In comparison to Nephridium (both protonephridium and meta nephridium ) and Malpighian tubules, which are found in invertebrates, Kidney is much more complex organ found in vertebrates. In kideny there is secretion , selective absorption and elimination process of excretory products.

3. The correct answer is option D - The saltwater is hyperosmotic to their cells and their bodies need to lose more water for balance.

Explanation: The saltwater contain more solutes in comparison to human cell, so it is hyperosmotic in comparison to human cell. So , Water from human cell goes out to where it is in high concentration to outside where water concentration is low. As a result of this water exit from the cell, body get dehydrated.

gladiator answered 2 years ago
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