CBSE Class 7 Answered

Faeces is the solid waste matter left after the food has been digested and discharged from the large intestine through the anus. Human excreta (faeces) vary in appearance and its state according to diet, health of the person and functioning of the digestive system. Due to the presence of mucus in it, the excreta is usually semisolid.

Excretion is the process by which waste products of metabolism and other non-useful materials are eliminated from an organism. The major excretory products in animals are ammonia, urea, uric acid, guanine, creatinine and carbon dioxide. Faeces is generally not considered as an excretory product because it was not taken into the cells of the body. They are the undigested remains of the food. Hence, they are discharged from the body during the process of defecation and not excretion.