Online Test — Digestion and Absorption
15 Questions • 15 min • Chapter MCQ
15:00
Question 1 of 15
Digestion is the process of breaking food into:
Larger insoluble molecules
Simple soluble molecules
Only water
Gases only
Explanation: Digestion produces simple, soluble, absorbable molecules.
Question 2 of 15
The correct order of the alimentary canal is:
Mouth → stomach → oesophagus → intestine
Mouth → oesophagus → stomach → small intestine → large intestine
Mouth → intestine → stomach
Stomach → mouth → intestine
Explanation: Food passes mouth → oesophagus → stomach → small intestine → large intestine.
Question 3 of 15
Food is pushed along the gut by muscular waves called:
Peristalsis
Osmosis
Diffusion
Filtration
Explanation: Peristalsis moves food through the canal.
Question 4 of 15
The main site of digestion and absorption is the:
Stomach
Small intestine
Large intestine
Mouth
Explanation: The small intestine is the main site of digestion and absorption.
Question 5 of 15
The enzyme in saliva that begins starch digestion is:
Pepsin
Salivary amylase (ptyalin)
Trypsin
Lipase
Explanation: Salivary amylase begins digesting starch in the mouth.
Question 6 of 15
Protein digestion begins in the stomach with the enzyme:
Amylase
Pepsin
Lipase
Maltase
Explanation: Pepsin begins protein digestion in the acidic stomach.
Question 7 of 15
Hydrochloric acid in the stomach mainly:
Digests fat
Makes the medium acidic and kills germs
Absorbs water
Emulsifies fat
Explanation: HCl makes the stomach acidic (for pepsin) and kills germs.
Question 8 of 15
Bile is produced by the:
Pancreas
Liver
Stomach
Salivary glands
Explanation: Bile is made by the liver and stored in the gall bladder.
Question 9 of 15
Bile helps digestion by:
Digesting protein
Emulsifying fats
Killing bacteria
Digesting starch
Explanation: Bile emulsifies fats into small droplets.
Question 10 of 15
The enzyme lipase digests:
Starch
Protein
Fat
Vitamins
Explanation: Lipase breaks fats into fatty acids and glycerol.
Question 11 of 15
The final product of protein digestion is:
Glucose
Amino acids
Fatty acids
Glycerol
Explanation: Proteins are digested into amino acids.
Question 12 of 15
Tiny finger-like projections that increase absorptive surface area are:
Villi
Cilia
Nodules
Stomata
Explanation: Villi increase the surface area for absorption.
Question 13 of 15
Fatty acids and glycerol are absorbed into the:
Blood capillaries
Lacteals (lymph)
Stomach
Bile duct
Explanation: Fat products enter the lacteals (lymph vessels) of the villi.
Question 14 of 15
Most of the remaining water is absorbed in the:
Mouth
Stomach
Large intestine
Oesophagus
Explanation: The large intestine absorbs most of the remaining water.
Question 15 of 15
Frequent watery stools that cause dehydration describe:
Constipation
Diarrhoea
Jaundice
Indigestion
Explanation: Diarrhoea is frequent watery stools, leading to dehydration.