Digestion & Absorption Test

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Digestion & Absorption Test - 3

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Weekly Quiz Competition

Question 1
4 / -1

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

Solution

After digestion, most of the monosaccharides are absorbed into the body via active transport using sodium ions. Fructose is absorbed via facilitated diffusion. Amino acids are absorbed via secondary active transport using sodium ions. Chylomicrons cannot enter blood capillaries and hence enter lacteals. Only 5% of starch is hydrolyzed in the mouth. Proenzyme pepsinogen is secreted by chief cells in the stomach
So, the correct answer is 'Fructose and amino acids are absorbed through intestinal mucosa with the help of carrier ions like Na⁺'.
Question 2
4 / -1

Read the following statements and select the correct option.
Statement 1 : The human small intestine is the longest portion in the alimentary canal.
Statement 2 : Absorption of digested food requires a very large surface area.

A
Both statement 1 and 2 are correct.

B
Statement 1 is correct but statement 2 is incorrect.

C
Statement 1 is incorrect but statement 2 is correct.

D
Both statements 1 and 2 are incorrect.

Solution

The human small inteestine is the longest (6.25m) part of alimentary canal. Villi present in the small intestine increase it surface area for absorption as most of the absorption occurs in small intestine.
Question 3
4 / -1

Carrier ions like Na⁺ facilitate the absorption of substances like

A
Amino acids and glucose

B
Glucose and fatty acids

C
Fatty acids and glycerol

D
Fructose and some amino acids

Solution

Most ions are actively absorbed along the length of small intestine. The absorption of Na⁺ is coupled with absorption of glucose and amino acids. Glucose and galactose are taken into the enterocyte by cotransport with sodium using the same transporter. Fructose enters the cell from the intestinal lumen via facilitated diffusion through another transporter. Fatty acids are combined with proteins within the cells and resulting chylomicrons are extruded. They enter lacteals and are transported to the circulation via lymph.
Question 4
4 / -1

Which of the following statements is false?

A
The stomach stores the food for 4-5 hours.

B
Gastric gland never secretes even a small amount of lipase.

C
Rennin, a proteolytic enzyme is found in gastric juice of infants.

D
All of these.

Solution

The chief cells of gastric glands secrete a small amount of gastric lipase that contributes little to digestion of fat.
Question 5
4 / -1

Which of the following statements is false?

A
The breakdown of most of biomacromolecules occurs in duodenum

B
Simple substances (digested foods) are absorbed in the jejunum and ileum

C
Significant digestive activity occurs in large intestine

D
Undigested and unabsorbed substances are passed on to the large intestine
Solution
The breakdown of most of the biomacromolecules happens in the duodenum part of the small intestine.
Whereas the simple substances are being absorbed by the jejunum and the ileum region of the small intestine.
The large intestine is responsible for the absorption of the food after its being completely digested in the small intestine.
Whereas the undigested and unabsorbed food materials are passed through the large intestine then to the rectum and finally it is excreted as excreta through the anus.
Hence, option (C) is a false statement out of the above statements.
Question 6
4 / -1

Which of the following statements is/are incorrect?
(i) Absorption of simple sugar, alcohol, some water and medicines takes place in stomach.
(ii) Maximum water absorption occurs in large intestine.
(iii) Small intestine is the major site of digestion and absorption of food.
(iv) Fatty acid and glycerol are absorbed by lacteals.
(v) Nothing is absorbed in mouth and large intestine.

A
(i), (iv) and (v)

B
(v) only

C
(iv) only

D
(ii) and (iii)

Solution

In the mouth certain drugs are absorbed. In the large intestine, water, some minerals and drugs are absorbed
Question 7
4 / -1

Which of the following statements are incorrect about chylomicrons?
(i) Chylomicrons are produced in the epithelial cells of the small intestine.
(ii) It contains triglycerides, cholesterol, and phospholipids.
(iii) They are protein-coated small vesicles.
(iv) Chylomicrons are released from the epithelial cell into lacteals.

A
(i) and (iv)

B
(ii) and (iii)

C
(i), (ii), (iii) and (iv)

D
None of these
Question 8
4 / -1

The backflow of faecal matter from the large intestine into the small intestine is prevented by the presence of

A
Epiglottis

B
Sphincter of Oddi

C
ileo-caecal valve

D
Gastro-esophageal sphincter

Solution

lleo-caecal valve is present at the junction of small intestine and large intestine. The ileo-caecal valve normally remains closed, opens briefly to let the contents of small intestine exit and closes again to prevent any backflow of waste materials from the large intestine into small intestine
Question 9
4 / -1

Read the following four statements (i) - (iv) with certain mistakes in two of them.
(i) Fructose is generally absorbed by simple diffusion.
(ii) The digestive wastes, solidified into coherent faeces in the rectum initiate an endocrine action causing an urge or desire for its removal.
(iii) The food mixes thoroughly with the acidic gastric juice of the stomach by the churning movements of its muscular wall and is called the chyme.
(iv) The secretions of the brush border cells of the mucosa along with the secretions of the goblet cells constitute the succus entericus.
Which of the above two statements have mistakes?

A
(i) and (ii)

B
(ii) and (iii)

C
(iii) and (iv)

D
(i) and (iii)

Solution

Fructose is generally absorbed by facilitated trasnport. The digestive wastes, solidified into coherent faeces in the rectum initiate a neutral reflex causing an urge or desire for its removal.
Question 10
4 / -1

Minerals are transported through _________ along the _________ stream of water.

A
xylem, descending

B
phloem, descending

C
xylem, ascending

D
phloem, ascending

Solution

Minerals are transported through xylem along the ascending stream of water. Phloem is used for the translocation of solutes and sometimes organic nitrogen compounds. Phloem exhibits both upward and downward movement of food along with the movement of water in the adjacent cells.

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Digestion & Absorption Test - 3

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Digestion & Absorption Test - 3

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SHARING IS CARING

Question 1

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

Chylomicrons are small lipoprotein particles that are transported from intestine into blood capillaries

About 60% of starch is hydrolysed by salivary amylase in our mouth

Oxyntic cells in our stomach secrete the proenzyme pepsinogen

Solution

Question 2

Both statement 1 and 2 are correct.

Statement 1 is correct but statement 2 is incorrect.

Statement 1 is incorrect but statement 2 is correct.

Both statements 1 and 2 are incorrect.

Solution

Question 3

Amino acids and glucose

Glucose and fatty acids

Fatty acids and glycerol

Fructose and some amino acids

Solution

Question 4

The stomach stores the food for 4-5 hours.

Gastric gland never secretes even a small amount of lipase.

Rennin, a proteolytic enzyme is found in gastric juice of infants.

All of these.

Solution

Question 5

The breakdown of most of biomacromolecules occurs in duodenum

Simple substances (digested foods) are absorbed in the jejunum and ileum

Significant digestive activity occurs in large intestine

Undigested and unabsorbed substances are passed on to the large intestine

Solution

Question 6

(i), (iv) and (v)

(v) only

(iv) only

(ii) and (iii)

Solution

Question 7

(i) and (iv)

(ii) and (iii)

(i), (ii), (iii) and (iv)

None of these

Question 8

Epiglottis

Sphincter of Oddi

ileo-caecal valve

Gastro-esophageal sphincter

Solution

Question 9

(i) and (ii)

(ii) and (iii)

(iii) and (iv)

(i) and (iii)

Solution

Question 10

xylem, descending

phloem, descending

xylem, ascending

phloem, ascending

Solution

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