What is true about small intestine–

Correct option is B

Sol. The small intestine is the major site for digestion and absorption of nutrients. It consists of three parts — the duodenum, jejunum, and ileum. Digestion is completed in the small intestine, especially in the duodenum and jejunum, with the help of enzymes from the pancreas and bile from the liver. The ileum, which is actually the last part of the small intestine (not the middle), absorbs vitamin B12 and bile salts. Therefore, only option (b) is completely true.
Explanation of each option:
· (a) Duodenum is not part of small intestine – Incorrect. The duodenum is the first part of the small intestine and plays a key role in mixing digestive juices.
· (b) Digestion is completed – Correct. Enzymes in the small intestine, especially from the pancreas and intestinal lining, complete digestion of proteins, fats, and carbohydrates.
· (c) Ileum is middle part of small intestine – Incorrect. Ileum is the last segment, not the middle. The jejunum is the middle portion of the small intestine.
· (d) All of these – Incorrect. Since only (b) is true and (a) and (c) are false, this option cannot be correct.