Tricky questions
7 min read

Digestion And Absorption

- Learning from one's mistakes is the wisest policy. Go through the section to know the common mistakes and get a hold on the solution to these mistakes.
1
When it comes to large intestine's role in absorption, we often say that it contributes to absorption of water. But the large intestine also absorbs vitamins such as thiamine, riboflavin, and vitamin K, which are synthesized by E. coli, a type of colon bacteria. Solve the question and get clarity on the function of the bacteria in the large intestine.
Escherichia coli in human intestine synthesizes: 
A
Vitamin B and D
B
Vitamin B and C
C
Vitamin A and K
D
Vitamin B and K
2
The parts of the alimentary canal include the mouth, pharynx, oesophagus, stomach, small intestine, and large intestine. Are you sure about the location in alimentary canal, where the process of digestion is completed? Let us clear this doubt by solving the question below.
The digestion of food is completed in which part of the alimentary canal?
A
Duodenum
B
Ileum
C
Stomach
D
Large intestine
3
Most of the intracellular enzymes function near neutral pH. With the exception of several digestive enzymes which work either in acidic range of pH or alkaline e.g. 2.0 pH for pepsin, rennin and 8.5 for trypsin, amylopsin.
So the key here is to learn the enzymes function and location to get the correct pH of medium where these digestive enzymes would be active.
Amylopsin and Rennin are carbohydrates and protein-digesting enzymes respectively. Amylopsin acts in ____ medium and Rennin acts in ____ medium.
A
Acidic only
B
Alkaline and acidic
C
Acidic and alkaline
D
Slightly acidic and acidic
4
Parasites are organisms that live in and feed off a living host. There are a variety of parasitic worms that might find their way into the alimentary canal. Among them the probability of intestinal parasitic infection is higher. The risk is more in places where food and drinking water may be contaminated and sanitation is poor. Common types of intestinal worms include: Flatworms, like tapeworms and flukes, roundworms, pinworms, and hookworms.
Which is not a parasite of the human intestine?
A
Ringworm
B
Pinworm
C
Threadworm
D
Tapeworm
5
Peristalsis is the movement of the alimentary canal, characterized by waves of alternate circular contraction and relaxation of the tube by which the contents are propelled onward. These movements are controlled by the Auerbach's plexus or myenteric plexus.
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Which of the following controls the peristaltic movement of
the intestine?

A
Sacral Plexus
B
Brachial Plexus
C
Discoidal Plexus
D
Auerbach's Plexus
6
The yellow brown colour of faeces is due to bile pigments like stercobilin and urobilin which are largely responsible for the colour of faeces. But that is not the only reason for the colour of faeces. Let us find out the exact reason by solving the given question.
Which of the following pigments are responsible for the brown color of human faeces?
A
Stercobilinogen
B
Stercobilin
C
Derivatives of bilirubin
D
All of the above
7
There are major 5 sphincters present in the alimentary canal, namely, 1) Oesophageal sphincter 2) Cardiac sphincter 3) Pyloric sphincter 4) Anal sphincter 5) Ileo-ceacal valve
But apart from these common sphincters, there is one more that is located at the junction of gallbladder and pancreatic duct, know as sphincter of Oddi. The bile and the pancreatic juices flow to the small intestine through a common duct that is opened and closed by the sphincter of Oddi. The dysfunction of this may cause SOD (Sphincter of Oddi Dysfunction). The SOD show similar symptoms and pain as that of gallbladder stones.
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Sphincter of Oddi is present:
A
At the opening of bile duct
B
At the opening of ductus choledocus
C
Both A and B
D
None of the above