The removal of remnant particles of digestion from the body is called

Step 1: Analyze the question The question asks for the term describing the removal of remnant (leftover) particles of digestion from the body. These are the undigested materials, such as fibre, that the body could not break down or absorb.

Step 2: Explain the concepts

• Assimilation: the use of absorbed digested food by body cells for energy, growth and repair. Nothing is removed here.
• Egestion: the removal of undigested food material (faeces) from the body through the anus. This material never became part of the body's cells or metabolism.
• Elimination: a general word for getting rid of anything. It is not the specific biological term for removing undigested food.
• Excretion: the removal of metabolic waste products made by the body's cells, such as urea, carbon dioxide and excess water (via kidneys, lungs and skin).

Step 3: Solve The waste in the question is the leftover of digestion, meaning food that was never absorbed or used by cells. This is not a product of metabolism, so it is not excretion. The correct term is egestion.

Step 4: Answer B. egestion

Exam tip: Remember the difference with this phrase: "Egestion = Exit of undigested food; Excretion = metabolic waste." If the waste was made inside cells, it is excretion. If it just passed through the gut without being absorbed, it is egestion.