Digestive System

When food is taken into the mouth, it is mechanically broken down by chewing (mastication) and mixed with saliva. Saliva contains enzymes like amylase (for carbohydrate digestion) and mucus (for lubrication). The chewed, moistened, and partially digested mass of food that is ready to be swallowed is called a bolus.
- Chyme: Semi-fluid mass passed from the stomach into the small intestine.
- Chyle: Milky lymphatic fluid with emulsified fats from the small intestine.
- Pellets: Undigested food remains, often regurgitated by birds. Hence, the correct term is bolus.

Egestion is a voluntary process as it is under conscious control. The urge to defecate arises due to reflex initiated by the presence of waste in the rectum, which makes the Reason a correct explanation of the Assertion.

Lipoprotein lipase acts on chylomicrons in the blood, hydrolyzing triglycerides into free fatty acids and glycerol. This enzyme is crucial for lipid metabolism in tissues like adipose and muscle.

Assertion (A): True — Pancreatic juice does contain steapsin, an enzyme that plays a role in fat digestion. Reason (R): False — Steapsin is involved in the digestion of fats, not proteins. Protein digestion is primarily carried out by enzymes like trypsin and chymotrypsin in pancreatic juice.