12th Grade > Biology
DIGESTION AND ABSORPTION MCQs
Total Questions : 45
| Page 1 of 5 pages
Answer: Option A. -> If both (A) and (R) are true and (R) is the correct explanation of (A)
:
A
The herbivores have a gigantic caecum (huge blind pouch) which contains billions of bacteria and participates in digestion. The Appendix of the herbivores also help in the digestion of cellulose.
:
A
The herbivores have a gigantic caecum (huge blind pouch) which contains billions of bacteria and participates in digestion. The Appendix of the herbivores also help in the digestion of cellulose.
Answer: Option C. -> Ileum of Small Intestine
:
C
Ileum is the part of small intestine. Its mucosa is raised into numerous microscopic projections called the villi. The villi contain a minute blind ended lymph vessel lacteals, which help in the absorption of fats. From the lacteals, the lipoprotein chylomicrons are carried into the blood stream directly via thoracic lymphatic duct.
:
C
Ileum is the part of small intestine. Its mucosa is raised into numerous microscopic projections called the villi. The villi contain a minute blind ended lymph vessel lacteals, which help in the absorption of fats. From the lacteals, the lipoprotein chylomicrons are carried into the blood stream directly via thoracic lymphatic duct.
Answer: Option A. -> Rennin
:
A
Chymosin, known also as rennin, is a proteolytic enzyme synthesized by chief cells in the stomach. Its role in digestion is to curdle or coagulate milk in the stomach, a process of considerable importance in the very young animal. If milk were not coagulated, it would rapidly flow through the stomach and miss the opportunity for initial digestion of its proteins.
:
A
Chymosin, known also as rennin, is a proteolytic enzyme synthesized by chief cells in the stomach. Its role in digestion is to curdle or coagulate milk in the stomach, a process of considerable importance in the very young animal. If milk were not coagulated, it would rapidly flow through the stomach and miss the opportunity for initial digestion of its proteins.
Answer: Option C. -> Liver
:
C
Detoxification or detoxication (detox for short) is the physiological or medicinal removal of toxic substances from a living organism, including the human body, which is mainly carried out by the liver.
:
C
Detoxification or detoxication (detox for short) is the physiological or medicinal removal of toxic substances from a living organism, including the human body, which is mainly carried out by the liver.
Question 5. Consider the following four statements and select the incorrect option, stating the ones that are true (T) and the ones that are false (F) :
I. Upper and Lower Esophageal Sphincters work with opposite peristaltic movements.
II. Entry of food into the stomach from the esophagus is mediated by receptive relaxation..
III. Myenteric plexus and Meissner's plexus help in lubrication of the esophagus.
IV. Failure in regulation of flow by Upper Esophageal Sphincter leads to GERD.
I. Upper and Lower Esophageal Sphincters work with opposite peristaltic movements.
II. Entry of food into the stomach from the esophagus is mediated by receptive relaxation..
III. Myenteric plexus and Meissner's plexus help in lubrication of the esophagus.
IV. Failure in regulation of flow by Upper Esophageal Sphincter leads to GERD.
Answer: Option D. -> I.T II. T III.T IV. F
:
D
Statement IV is false because, GERD is caused due to prolapsed reflexes of the Lower Esophageal Sphincter (NOT the UES) epithelium leading to failure in the mechanism of Lower Esophageal Sphincter which pushes gastric acid juices into the esophagus causing GERD or Gastroesophageal reflux disease.
:
D
Statement IV is false because, GERD is caused due to prolapsed reflexes of the Lower Esophageal Sphincter (NOT the UES) epithelium leading to failure in the mechanism of Lower Esophageal Sphincter which pushes gastric acid juices into the esophagus causing GERD or Gastroesophageal reflux disease.
:
As digested fats are insoluble in water, they are coated with small quantity of proteins and are called chylomicrons. These are then absorbed into lacteals of the intestinal villi from where they reach venous blood and subsequently other parts via the bloodstream.
Answer: Option C. -> Indigestion
:
C
Anxiety and eating spicy food together in an otherwise normal human, may lead to indigestion.
:
C
Anxiety and eating spicy food together in an otherwise normal human, may lead to indigestion.
Answer: Option C. -> Assertion is true but the reason is false.
:
C
Small intestine is the main site of carbohydrate digestion. Here the pancreas secrets the pancreatic amylase. Oancreatic amylase converts starch and dextrins into maltose.
:
C
Small intestine is the main site of carbohydrate digestion. Here the pancreas secrets the pancreatic amylase. Oancreatic amylase converts starch and dextrins into maltose.
Answer: Option D. -> Goblet cell
:
D
A column-shaped cell found in the respiratory and intestinal tracts, which secretes the main component of mucous.
:
D
A column-shaped cell found in the respiratory and intestinal tracts, which secretes the main component of mucous.
Answer: Option C. -> If (A) is true, but (R) is false
:
C
A sphincter is a circular muscle that normally maintains constriction of a natural body passage . The lower oesophageal sphincter (or cardiac sphincter), which resides at the top of the stomach. This sphincter prevents the acidic contents of the stomach from moving upward into the oesophagus.
:
C
A sphincter is a circular muscle that normally maintains constriction of a natural body passage . The lower oesophageal sphincter (or cardiac sphincter), which resides at the top of the stomach. This sphincter prevents the acidic contents of the stomach from moving upward into the oesophagus.
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