Which of the following is not an excretory product?

Explanation

This question is asking which of the given options is not an excretory product. Excretory products are substances that are eliminated from the body after being produced as waste products. The options given are urine, sweat, faeces, salt, and carbon dioxide. Urine is a waste product that is produced by the kidneys and eliminated from the body through the urinary system. Sweat is also a waste product that is produced by sweat glands and eliminated through the skin. Carbon dioxide is a waste product that is produced by cells during respiration and eliminated from the body through the lungs. Salt is not a waste product, but rather an essential mineral that is needed by the body for various functions such as regulating blood pressure and maintaining fluid balance. The body can eliminate excess salt through urine, but it is not considered an excretory product. Faeces, on the other hand, is an excretory product that is produced by the digestive system and eliminated from the body through the rectum and anus. It is made up of undigested food, bacteria, and other waste products. Therefore, the correct answer to this question is option C: faeces. It is important to note that the other options given are all excretory products.