Biology - Digestive System Questions for SSC CGL (with Answers)

Answer: C. Mouth

Salivary amylase in the mouth starts breaking starch into simpler sugars.

Answer: A. Small intestine

The small intestine is the longest part of the alimentary canal, about 6-7 metres in adults.

Answer: D. Villi

Villi line the inner wall of the small intestine and greatly increase absorptive surface area.

Answer: A. Salivary amylase

Saliva contains salivary amylase (ptyalin), which converts starch into maltose.

Answer: C. Liver

The liver is the largest gland in the human body.

Answer: C. Absorption of water

The large intestine mainly absorbs water (and some salts) from undigested food.

Answer: D. Peristalsis

Peristalsis is the rhythmic contraction and relaxation of gut muscles that moves food along.

Answer: B. Amino acids

Protein digestion ends with amino acids, which are absorbed in the small intestine.

Answer: C. Emulsifying fats

Bile salts emulsify fats into small droplets, increasing surface area for lipase action.

Answer: C. Proteins

Pepsin, secreted in the stomach, begins the digestion of proteins.

Answer: B. Tooth enamel

Enamel, covering the crown of teeth, is the hardest substance in the human body.

Answer: B. Liver

Bile is produced by the liver; the gall bladder only stores and releases it.

Answer: A. Pyloric sphincter

The pyloric sphincter at the stomach's exit controls the release of food into the duodenum.

Answer: C. Pancreas

Trypsin is present in pancreatic juice and digests proteins in the small intestine.