Practice Start Test

Digestion and Absorption

NEET Biology · 88 questions · Page 8 of 9 · Click an option or "Show Solution" to reveal answer

Q71
Duodenum has characteristic Brunner's glands which secrete two hormones called
A Kinase, estrogen
B Secretin, cholecystokinin
C Prolactin, parathormone
D Estradiol, progesterone
Correct Answer
Option B
Solution

(b) Secretin inhibits gastric movement. Cholecystokinin stimulates release of pancreatic enzymes and bile.

Q72
Secretin and cholecystokinin are digestive hormones secreted in :
A Pyloric stomach
B Duodenum
C Ileum
D Oesophagus
Correct Answer
Option B
Solution

(b) Secretin and cholecystokinin are secreted in the duodenum in response to acidic chyme and fat.

Q73
Epithelial cells of the intestine involved in food absorption have on their surface:
A pinocytic vesicles
B microvilli
C zymogen granules
D phagocytic vesicles
Correct Answer
Option B
Solution

(b) Presence of microvilli on intestinal epithelial cells increases the surface area for absorption of food.

Q74
What will happen if the secretion of parietal cells of gastric glands is blocked?
A Gastric juice will be deficient in chymosin
B Gastric juice will be deficient in pepsinogen
C In the absence of HCI secretion, inactive pepsinogen is not converted into the active enzyme pepsin
D Enterokinase will not be released from the duodenal mucosa
Correct Answer
Option C
Solution

(c) Without HCl from parietal cells, pepsinogen cannot be converted into active pepsin.

Q75
Which one of the following pairs of food components in humans reaches the stomach totally undigested?
A Starch and fat
B Fat and cellulose
C Starch and cellulose
D Protein and starch
Correct Answer
Option B
Solution

(b) Fat and cellulose both reach the stomach totally undigested.

Q76
Which one of the following statements is true regarding digestion and absorption of food in humans?
A Fructose and amino acids are absorbed through intestinal mucosa with the help of carrier ions like Na+.
B Chylomicrons are small lipoprotein particles that are transported from intestine into blood capillaries.
C About 60% of starch is hydrolysed by salivary amylase in our mouth
D Oxyntic cells in our stomach secrete the proenzyme pepsinogen.
Correct Answer
Option A
Solution

(a) Fructose and amino acids are absorbed through intestinal mucosa with the help of carrier ions like Na+.

Q77
A young infant passes yellowish stool while feeding on white mother's milk. What is this yellow colour due to?
A bile pigments passed through bile juice
B undigested milk protein casein
C pancreatic juice poured into duodenum
D intestinal juice
Correct Answer
Option A
Solution

(a) The yellowish colour of stools is due to bile pigments (bilirubin and biliverdin) passed through bile juice.

Q78
One of the constituents of the pancreatic juice while poured into the duodenum in humans, is:
A trypsinogen
B chymotrypsin
C trypsin
D enterokinase
Correct Answer
Option A
Solution

(a) Trypsinogen is the inactive form secreted by pancreas. Enterokinase (from duodenal mucosa) activates it to trypsin.

Q79
Which one of the following enzymes carries out the initial step in the digestion of milk in humans?
A Pepsin
B Rennin
C Lipase
D Trypsin
Correct Answer
Option B
Solution

(b) Rennin is an enzyme essential for protein (casein) digestion. It is active in acidic medium.

Q80
Which enzymes act on baked potatoes starting from the mouth?
A Salivary maltase - carboxypeptidase - trypsinogen
B Pancreatic amylase - salivary amylase - lipases
C Disaccharidase like maltase - lipases - nucleases
D Salivary amylase - pancreatic amylase - disaccharidases
Correct Answer
Option D
Solution

(d) Salivary amylase, then pancreatic amylase, then disaccharidases act on starch in potatoes.

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