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.
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461. Vaccination is:
- A. Natural active immunity
- B. Artificial active immunity
- C. Natural passive immunity
- D. Artificial passive immunity
Explanation: Active immunity is always antigen based while passive immunization is antibodies based.
Correct answer: Artificial active immunity462. ln immunoglobulins/antibodies, two light chains and two heavy chains are linked to each other by?
- A. Covalents bonds
- B. Disulphide bonds
- C. Hydrogen bonds
- D. Ionic bonds
Explanation: An antibody, also known as an immunoglobulin, is a large, Y-shaped protein used by the immune system to identify and neutralize foreign…
Correct answer: Disulphide bonds- A. Artificial active immunity
- B. Artificial passive immunity
- C. Natural active immunity
- D. Natural passive immunity
Explanation: Therefore, the correct answer is B) Artificial passive immunity, as the administration of anti-venom provides immediate protection through…
Correct answer: Artificial passive immunity- A. Antisera
- B. Antibiotics
- C. Antibodies
- D. Antigens
Explanation: Therefore, the correct answer is D) Antigens, as polio vaccines contain antigens from the poliovirus to induce immunity against the…
Correct answer: Antigens- A. Naturally induced active immunity
- B. Active immunity
- C. Artificially induced active immunity
- D. Passive immunity
Explanation: Therefore, based on the information provided, the person would most likely have developed A) Naturally Induced Active Immunity, as their…
Correct answer: Naturally induced active immunity- A. Gene therapy
- B. Drugs
- C. Vaccines
- D. Antibodies
Explanation: Therefore, the correct answer is C) Vaccines, as they are specifically designed to prevent diseases by artificially activating the immune…
Correct answer: Vaccines- A. Antibiotics
- B. Antigens
- C. Achaea
- D. Transposon
Explanation: Therefore, the correct answer is B) Antigens, as they are foreign substances that stimulate the immune system and lead to the formation of…
Correct answer: Antigens- A. Self against antigens
- B. Self against self
- C. Antigens against self
- D. Antigens self -destroyed
Explanation: Therefore, the correct answer is B) Self against self, as autoimmune diseases occur when the immune system attacks the body's own cells or…
Correct answer: Self against self- A. Heterotrophs
- B. Parasitic
- C. Detritivores
- D. Autotrophs
Explanation: Therefore, the correct answer is D) Autotrophs, as insectivorous plants are capable of photosynthesis and obtain energy from the sun like…
Correct answer: Autotrophs- A. Nitrogen
- B. Lipids
- C. Carbohydrates
- D. N, C, Cu, Zn
Explanation: Therefore, the correct answer is A) Nitrogen, as carnivorous plants use insects and other small organisms as a source of nitrogen to…
Correct answer: Nitrogen- A. Sarracenta purpea
- B. Drosera intermedia
- C. Pitcher plant
- D. Dionaea muscipula
Explanation: Therefore, the correct answer is D) Dionaea muscipula, as it is commonly known as the Venus flytrap and exhibits the described mechanism…
Correct answer: Dionaea muscipula- A. Liver
- B. Salivary glands
- C. Spleen
- D. Colon
Explanation: Therefore, the correct answer is C) Spleen, as it is not part of the digestive system of humans.
Correct answer: Spleen- A. Pharynx to trachea
- B. Esophagus to stomach
- C. Stomach to esophagus
- D. Duodenum to stomach
Explanation: Therefore, the correct answer is C) Stomach to esophagus, as the cardiac sphincter prevents the backflow of food from the stomach to the…
Correct answer: Stomach to esophagus- A. Peristalsis
- B. Rate of blood flow
- C. Heart Rate
- D. Breating rate
Explanation: Therefore, the correct answer is A) Peristalsis, as the stimulation of the parasympathetic nervous system increases the rhythmic…
Correct answer: Peristalsis- A. Stomach
- B. Rectum
- C. Ileum
- D. Duodenum
Explanation: Therefore, the correct answer is D) Duodenum, as it is where proteins are completely digested in the digestive system.
Correct answer: Ileum- A. Outer anal sphiniter
- B. Both outer and inner anal sphiniters
- C. Inner and sphiniter
- D. Connot be inhibited
Explanation: Therefore, the correct answer is B) Both outer and inner anal sphincters, as conscious contraction of both sphincters can inhibit the…
Correct answer: Outer anal sphiniter- A. Soluble food into problem
- B. Non-diffusible food into diffusible
- C. Starch into maltose
- D. Small food particles into large partcles
Explanation: Therefore, the correct answer is B) Non-diffusible food into diffusible, as digestion involves converting large, non-diffusible food…
Correct answer: Non-diffusible food into diffusible- A. Nostrils
- B. Pharynx
- C. Nasal cavities
- D. Buccal cavity
Explanation: Therefore, the correct answer is B) Pharynx, as it is a shared structure between the digestive and respiratory systems.
Correct answer: Pharynx- A. 1
- B. 2
- C. 4
- D. 6
Explanation: Therefore, the correct answer would be either A) 1 (referring to the sublingual gland) or B) 2 (referring to the sublingual gland and the…
Correct answer: 1- A. Mechinical
- B. Biochemical
- C. Chemical
- D. Enzymatic
Explanation: Therefore, the correct answer is A) Mechanical, as mechanical digestion does not directly aid in the absorption of food.
Correct answer: Mechinical