Free Digestion MCQs with Answers
680 Digestion MCQs from Biology, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
The human digestive system covers the organs from mouth to anus, the movement of food, and the mechanical and chemical breakdown of carbohydrates, proteins and fats. It also includes the roles of digestive enzymes, bile, absorption through intestinal villi, and the assimilation of nutrients by body cells.
Last updated
Read the Digestion notesFree MDCAT chapter notes with key terms680 questions · page 20 of 34
- A. Albumin, globulin and globular proteins are present in respiratory pigments
- B. Myoglobin and haemoglobin has higher affinity for nitrogen
- C. Myoglobin has more affinity for oxygen as compared to haemoglobin
- D. Cyanide and haemoglobin has low affinity for oxygen
Explanation: Myoglobin, a respiratory pigment found in muscle cells, has a higher affinity for oxygen compared to hemoglobin.
Correct answer: Myoglobin has more affinity for oxygen as compared to haemoglobin- A. Pulmonary tuberclosis
- B. Emphysema
- C. Rickets
- D. Lungs cancer
Explanation: Rickets is not a respiratory disorder; it is a disorder of the skeletal system.
Correct answer: Rickets- A. Lung cancer
- B. Emphysema
- C. Ashtma
- D. Bronchitis
Explanation: In heavy smokers, prolonged exposure to harmful chemicals in tobacco smoke can lead to the destruction and enlargement of the alveoli in…
Correct answer: Emphysema- A. Cancer
- B. Emphysema
- C. Asthma
- D. Tuberculosis
Explanation: Tuberculosis (TB) is a respiratory disorder that can be related to malnutrition.
Correct answer: Tuberculosis- A. Emphysema
- B. T.B
- C. Cancer
- D. Ashtma
Explanation: The breakdown of the thin walls of the alveoli is a characteristic feature of emphysema.
Correct answer: Emphysema- A. Photosynthesis
- B. Respiration
- C. Transportation
- D. Penneability
Explanation: Active transport is a process that requires energy, often derived from cellular respiration, to move molecules or ions against their…
Correct answer: Respiration- A. Hyperplasmic
- B. Isotonic
- C. Hipertonic
- D. Hypotonic
Explanation: In an isotonic solution, the solute potential and pressure potential are equal to the water potential.
Correct answer: Isotonic- A. Xylem
- B. Cortex
- C. Endodermis
- D. Pericycle
Explanation: The apoplast pathway can transport water and minerals up to the endodermis, which is a specialized layer of cells in the root.
Correct answer: Endodermis- A. Apoplast pathway
- B. Symplast pathway
- C. Vacuolar pathway
- D. Tonoplast pathway
Explanation: The apoplast pathway is the route taken by water in plants through the non-living spaces of adjacent cell walls.
Correct answer: Apoplast pathway- A. Tonoplast
- B. Apoplast
- C. Symplast
- D. Vacuolar
Explanation: In the root cells, the apoplast pathway becomes discontinuous in the endodermis due to the presence of Casparian strips.
Correct answer: Apoplast- A. Symplast pathway
- B. Vacuolar pathway
- C. Mineral absorption pathway
- D. Apoplast pathway
Explanation: The movement of water and minerals down their concentration gradient through plasmodesmata, from cell to cell in the cortex, endodermis…
Correct answer: Symplast pathway- A. Plasma
- B. Blood cells
- C. Blood Protein
- D. A and B
Explanation: About 55% of the volume of human blood is plasma. Plasma is the liquid component of blood that makes up the majority of its volume.
Correct answer: Plasma- A. Aorta
- B. Ventricles
- C. Auricles
- D. Atrioventricular valves
Explanation: Option D is correct.The chordae tendinae of the heart are extensions of atrioventricular valves of the papillary muscles.
Correct answer: Atrioventricular valves- A. Membranous
- B. Muscular
- C. Ligamentous
- D. All of these
Explanation: The nature of valves in the heart is membranous. They are composed of sheets of tough membrane like connective tissue (leaflets) that act…
Correct answer: Membranous- A. Right atrium to right ventricles
- B. eft atrium to left ventricles
- C. Right atrium to left atrium
- D. Left ventricle to left atrium
Explanation: The mitral valve does not prevent the flow of blood from the left ventricle to the left atrium.
Correct answer: Left ventricle to left atrium- A. Pulmonary artery
- B. Coronary artery
- C. Hepatic artery
- D. Iliac arteries
Explanation: Option B is correct.The first artery that arises from the base of the aorta is the coronary artery.
Correct answer: Coronary artery- A. Bi and tricuspid valves are opened
- B. Semilunar valves are closed
- C. Bi and tricuspid valves are opened and semilunar valves are closed
- D. Bi and tricuspid valves are closed and semilunar valves are opened
Explanation: At the start of ventricular contraction, the biventricular heart valves (mitral and tricuspid valves) are closed and the semilunar valves…
Correct answer: Bi and tricuspid valves are closed and semilunar valves are opened- A. Right Semi lunar valve
- B. Left AV valve
- C. Left Semi lunar valve
- D. Right AV valve
Explanation: The right semilunar valve allows blood to pass from the right ventricle of the heart to the pulmonary artery.
Correct answer: Right Semi lunar valve- A. Smooth and involuntary
- B. Smooth and voluntary
- C. Striated and involuntary
- D. Striated and voluntary
Explanation: The myocardium of the heart is both striated and involuntary.Striated means that the muscle fibers have a striped appearance when viewed…
Correct answer: Striated and involuntary- A. Left
- B. Superior
- C. Right
- D. Both A and B
Explanation: Yes, only the left systemic arch is present in humans. The systemic arch is a large blood vessel that carries oxygenated blood from the…
Correct answer: Left