Difficult Questions
8 min read

Digestion And Absorption

- Practice is the key to success. Try your hands on the difficult questions to master the chapter.
1
Infants feed only on milk and hence enzymes found in gastric juice of infants are a bit different that from children or adults. Check out the given question to know more.
Gastric juice of infants contains:
A
Pepsinogen, lipase and rennin
B
Amylase, rennin and pepsinogen
C
Maltase, pepsinogen and rennin
D
Nuclease, pepsinogen and lipase
2
Do all animal have same type of dentition? Well, as animals have different types of food habits, their dentition pattern also varies. For example, most of the reptiles, amphibians, fishes are homodont whereas almost all omnivores are heterodont.
Study the following passage:
Most of the vertebrates have jaws with teeth. The mode of arrangement of teeth on the jaws is called dentition.
The various types of teeth seen in mammals are incisors (I) canines (C) premolars (P) and molars (M). They are used for biting, tearing, chewing and grinding, respectively.
Canines, the tearing teeth are well-developed in carnivores and ill-developed or absent in herbivores.

Now answer the following:
(i) In frogs, all the teeth in the upper jaw look-alike, whereas in human beings they are different. The type of dentition in human beings can be called .........
(a) Homodont  (b) Isodont (c) Heterodont  (d) Acrodont
(ii) The dental formula of a mammal is written as ICPM=2023/1023. The teeth missing in it are ................
(a) Incisors (b) Canines (c) Premolars (d) Molars
3
Rennin is a proteolytic enzyme found in gastric juice, it helps in the digestion of milk proteins. The digestive juices found in stomach are mostly active in very acidic pH.
Rennin acts on: 
A
Proteins in stomach
B
Milk; changing casein into paracaseinate at 7.2 - 8.2 pH
C
Fats in intestine
D
Milk; changing casein into calcium paracaseinate at 1-3 pH
4
Sphincters are specialized muscles that are located at the upper esophagus (upper esophageal sphincter (UES)), gastroesophageal junction (lower esophageal sphincter (LES)), antroduodenal junction (pylorus), ileocecal junction (ICJ), and the anus (anal sphincter).
Digestive System
Match column I with column II and select the correct option from the given codes. 
Column I
(Sphincter)
Column II
(Location)
A.Sphincter ani Internus(i)Opening of hepatopancreatic ampulla into duodenum
B.Cardiac sphincter(ii)Between duodenum and posterior stomach 
C.Sphincter of Oddi(iii)Guarding the terminal part of alimentary canal 
D.Ileocaecal sphincter(iv)Between oesophagus and anterior stomach 
E.Pyloric sphincter(v)Between small intestine and large intestine 
A
A-(iii), B-(ii), C-(iv), D-(i), E-(v)
B
A-(ii), B-(v), C-(i), D-(iv), E-(iii)
C
A-(iii), B-(iv), C-(i), D-(v), E-(ii)
D
A-(iv), B-(iii), C-(i), D-(ii), E-(v)
5
Auerbach's plexus is also know as the myenteric plexus. It is located between the longitudinal and circular muscle layers of the alimentary cannel. Auerbach's plexus provides motor innervation to both layers of the muscular layer of the gut, having both parasympathetic and sympathetic input.
Auerbach's plexus are found in
A
Below dermis and made up of muscles
B
Outer to muscularis externa and made up of nerves
C
Below muscularis interna
D
Layer of podocytes in glomerulus of kidney
6
Pancreatic juices are a liquid secreted by the pancreas, which contains a variety of enzymes, including trypsinogen, chymotrypsinogen, elastase, carboxypeptidase, pancreatic lipase, nucleases and amylase.
One of the constituents of the pancreatic juice which is poured into the duodenum in human beings is:
A
Trypsinogen
B
Chymotrypsinogen
C
Trypsin
D
Both A and B
7
Gastric secretion occurs in three phases: cephalic, gastric, and intestinal. During each phase, the secretion of gastric juice can be stimulated or inhibited. The five major hormones that are involved in regulation of gastric secretion are: gastrin ( stomach ), secretin ( small intestine ), cholecytokinin (small intestine), gastric inhibitory peptide (small intestine), and motilin (small intestine).
Now that you know the hormones involved, try to solve the given question.
Identify the correct sequence of hormones involved in:
Inhibition of gastric secretion
Stimulation of gastric secretion
Pancreatic secretion and 
Bile secretion
A
Gastrin, secretin, Enterokinin and CCK
B
Enterogastrone, gastrin, pancreozymin and CCK
C
Gastrin, Enterogastrone, CCK and pancreozymin
D
Secretin, Enterogastrone, Secretin and enterokinin
8
Trypsinogen is the precursor form of trypsin, a digestive enzyme which is an inactive substance secreted by the pancreas, from which the digestive enzyme trypsin is formed in the duodenum. Trypsinogen is activated by enteropeptidase (also known as enterokinase found in small intestine).
Assertion
Gastrin is a hormone that is released from the gastrointestinal tract and helps in digestion.
Reason
It promotes secretion of HCl and trypsinogen.
A
Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
B
Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
C
Assertion is correct but Reason is incorrect
D
Both Assertion and Reason are incorrect