Biology · Science General

Human Digestive System

1,953 Questions

The human digestive system explores the breakdown of biomacromolecules, covering organs from the stomach to the small intestine. It involves physiological processes like chyme movement, pH levels, and nutrient absorption in the gut. These fundamental biology concepts are regularly featured in medical and general science competitive exams.

Small intestine functionsBiomacromolecule breakdownStomach and digestionIntestinal bacteria

Human Digestive System Questions

Multiple choice

Trypsin is an enzyme which changes

  1. Starch to maltose

  2. Proteins to peptones

  3. Peptones to peptide

  4. Maltose to glucose
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Trypsin is an enzyme which changes peptones to peptide.

Multiple choice

Digestion is a process of

  1. Hydrolysis

  2. Oxidation

  3. Reduction

  4. Redox reaction
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

During digestion hydrolytic enzymes break down proteins, carbohydrates, and fats into their monomeric units. So digestion is a process of hydrolysis.

Multiple choice

Cholycystokinin hormone helps in

  1. secretion of gastric juice

  2. secretion of bicarbonate

  3. inhibits gasric juice secretion

  4. contraction of gall bladder
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Cholycystokinin contracts gall bladder.

Multiple choice

Outermost layer of alimentary canal is known as

  1. Muscularis

  2. Serosa

  3. Mucosa

  4. Sub-mucosa
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The wall of alimentary canal from oesophagus to rectum possesses four layers; namely outer serosa, second muscularis, third sub-mucosa and inner mucosa.

Multiple choice

Digestion of food is a _____________.

  1. a physical change

  2. a temporary change

  3. a reversible change

  4. a chemical change

  5. a spontaneous change
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

As gastric juices, saliva and other chemicals break it down into other substances.

Multiple choice

Directions: Choose the best definition from the options given.

Pharynx

  1. A non-metallic oxide

  2. Sticking together

  3. Most solvent

  4. Upper area of the alimentary canal
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The pharynx is the part of the throat behind the mouth and nasal cavity, leading to the esophagus and larynx. It serves as a common passage for both food and air, making it the upper area of the alimentary canal. It is a biological term.

Multiple choice

The enzyme present in the salaiva of man is

  1. pepsin

  2. renin

  3. amylase

  4. none of these
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Salivary amylase, also known as ptyalin, is the primary enzyme found in human saliva. It begins the digestion process by breaking down complex starches into simpler sugars like maltose. Pepsin and renin are enzymes found in the stomach, not the mouth.