The order of passage of food in the digestive system is

Analyze the question: You are asked for the correct sequence in which food moves through the lower part of the digestive system.

Concept: After the stomach, food passes through the small intestine (duodenum → jejunum → ileum). From the ileum it enters the large intestine, which begins with the caecum (a pouch at the junction, with the appendix attached). Food then moves through the colon (ascending → transverse → descending → sigmoid), then into the rectum, and finally leaves through the anus.

The correct general order is:

Ileum → caecum → colon (large intestine) → rectum → anus

Checking each option:

• A. ileum → caecum → large intestine → rectum. This matches the correct order. (The caecum is technically the first part of the large intestine, but the sequence is still right in the order of passage.)
• B. ileum → colon → caecum → rectum. Wrong, because the caecum comes before the colon.
• C. large intestine → ileum → caecum → rectum. Wrong, because the ileum is part of the small intestine and comes before the large intestine.
• D. colon → caecum → ileum → rectum. Wrong, because it reverses the order of the ileum, caecum and colon.

Tip: Remember the flow as "I-C-C-R": Ileum → Caecum → Colon → Rectum. Anything that puts the ileum after the caecum or colon is wrong, because the small intestine always comes before the large intestine.