Anaerobic process

(A) takes place in yeast during fermentation.

(B) takes place in the presence of oxygen.

(C) produces only energy in the muscles of human beings.

(D) produces ethanol, oxygen and energy.

OR

Most of the digestion and absorption of the food takes place in the

The second part of the question (the 'OR' alternative) matches the provided options. It asks where most of the digestion and absorption of food takes place.

• Option A is correct because the small intestine is the site of complete digestion of carbohydrates, proteins, and fats. It receives secretions from the liver (bile) and pancreas (pancreatic juice) to break down food completely. Additionally, its inner lining has numerous finger-like projections called villi, which drastically increase the surface area for the absorption of digested food into the bloodstream.
• Option B is incorrect because the liver is an associated digestive gland that secretes bile juice; food does not enter or get digested/absorbed inside the liver.
• Option C is incorrect because the stomach only initiates protein digestion (via pepsin) and mixes food into a semi-solid state; complete digestion and major absorption do not occur here.
• Option D is incorrect because the large intestine is primarily responsible for absorbing water and some salts from the remaining unabsorbed food waste, not for digesting or absorbing nutrients.