Question

Kidneys are excretory organs in

• A. All chordates
• B. Mammals only
• C. Mammals and amphibians only
• D. Mammals, reptiles and amphibians only

Answer 1

Answer: (A), (C)

The correct options are
A All chordates
C Mammals and amphibians only

For many chordates, the urinary system is a critical component of the excretory system. It is made up of organs such as the kidneys and bladder, structures such as a urethra or cloaca, and even arteries such as the aorta. The urinary system is responsible for both creating and excreting urine, which it does to regulate the amount of water and solutes within the body. Amazingly enough, the urinary system also works closely with hormones in your body that signal when you start to become dehydrated or when there is too much fluid in your body.

So, the correct option is 'All chordates'.