Digestion and Absorption Test

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Digestion and Absorption Test - 63

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Weekly Quiz Competition

Question 1
1 / -0

The given flowchart shows the fate of carbohydrates during digestion in the human alimentary canal. Identify the enzymes acting at stages indicated as A, B, C and D and select the correct option.

A
A - amylase, B - maltase, C - lactase, D - invertase

B
A - amylase, B - maltase, C - invertase, D - lactase

C
A - amylase, B - invertase, C - maltase, D - lactase

D
A - amylase, B - lactase, C - maltase, D - invertase

Solution

A - amylase
B - lactase
C - maltase
D - invertase
So, the correct answer is (d).
Question 2
1 / -0

Which one of the following options is matching the site of action on the given substrate, the enzyme acting upon it and the end product ?

A
Small intestine : Proteins $$\overset{Pepsin}{\rightarrow}$$ Amino acids

B
Stomach : Fats $$\overset{Lipase}{\rightarrow}$$ Micelles

C
Duodenum : Triglycerides $$\overset{Trypsin}{\rightarrow}$$ Monoglycerides

D
Small intestine.: Starch $$\overset{\alpha - amylase}{\rightarrow}$$ Disaccharide (maltose)

Solution

During digestion, starch is partially transformed into maltose by the pancreatic or salivary enzymes called amylase; maltase secreted by the intestine then converts maltose into glucose.
So, option D is the correct option.
Question 3
1 / -0

If we take food rich in lime juice, then

A
Action of ptyalin on starch is enhanced

B
Action of ptyalin on starch is reduced

C
Action of ptyalin on starch is unaffected

D
Action of ptyalin on starch stops.

Solution

If we take food rich in lime juice, the action of ptyalin on starch is reduced because lime juice contains a mild organic acid (citric acid) and consuming food with lime juice will cause a lowering a pH in the mouth. As a consequence, the activity of ptyalin will be inhibited if pH drops below the optimum range of 5.6-6.9.

So, the correct answer is (b).
Question 4
1 / -0

Digestion of proteins begins in the (i) and digestion of polysaccharides begins in the (ii)
(i) (ii)

A
mouth, stomach

B
stomach, small intestine

C
stomach, mouth

D
stomach, stomach

Solution

(i) stomach
(ii) mouth
So, the correct answer is (c).
Question 5
1 / -0

Match the two columns and select the right one among options given.
Column I Column II
A. Duodenum (i) A cartilaginous flap
B. Epiglottis (ii) Small blind sac
C. Glottis (iii) 'U' shaped structure emerging from the stomach
D. Caecum (iv) Opening of wind pipe

A
A-(i), B-(ii), C-(iii), D-(iv)

B
A-(iv), B-(iii), C-(iv), D-(i)

C
A-(iii), B-(i), C-(iv), D-(ii)

D
A-(ii), B-(iv), C-(i), D-(iii)

Solution

(A) Duodenum - 'U' shaped structure emerging from the stomach
(B) Epiglottis - A cartilaginous flap
(C) Glottis - Opening of wind pipe
(D) Caecum - Small blind sac
So, the correct answer is (c).

Question 6

1 / -0

Match the two columns and select the correct among options given.

	Column I		Column II
A.	Biomacromolecules of food	(i)	Alimentary canal and associated gland
B.	Human digestive system	(ii)	Embedded in jawbones
C.	Stomach	(iii)	Outer wall of visceral organs
D.	Thecodont	(iv)	Converted into simple substances
E.	Serosa	(v)	J-shaped bag like structure

A-(ii), B-(i), C-(v), D-(iii), E-(iv)

A-(iv), B-(i), C-(v), D-(ii), E-(iii)

A-(i), B-(ii), C-(iii), D-(iv), E-(v)

A-(i), B-(iii), C-(ii), D-(iv), E-(v)

Solution

(A) Biomacromolecules of food - Converted into simple substances

(B) Human digestive system - Alimentary canal and associated gland

(D) Thecodont - Embedded in jawbones

(E) Serosa - Outer wall of visceral organs

So, the correct answer is (b).

Question 7
1 / -0

Stool of a person is whitish grey coloured due to malfunction of which of the following organs?

A
Pancreas

B
Spleen

C
Kidney

D
Liver

Solution

The stool of a person is whitish grey colored due to malfunction of 'liver'.
So the correct option is D.
Question 8
1 / -0

Which of the following statements is incorrect?

A
Faecal accumulation in the rectum initiates a neural reflex causing an urge for its removal

B
Irregular bowel movements cause constipation.

C
In diarrhoea absorption of food is increased.

D
All of these

Solution

In diarrhoea, absorption of food is reduced. So, the correct answer is (c)
Question 9
1 / -0

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 statements 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 correct answer is (a).
Question 10
1 / -0

If the inner surface of the ileum in the human small intestine was smooth, rather than being folded and subdivided into vilii, which of the following statements would be true?

A
The rate of absorption of digested food molecules would be higher, because the digested food would pass more easily through the digestive tract.

B
Digestion would not be as effective, because there would be fewer cells secreting trypsin (a protein-digesting enzyme).

C
Humans would have needed to evolve a much longer small intestine to absorb sufficient nutrients from their food.

D
Humans would not be able to survive, because the digestive tract would be more susceptible to damage.

Solution

The correct answer is (c).

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	Column I		Column II
A.	Duodenum	(i)	A cartilaginous flap
B.	Epiglottis	(ii)	Small blind sac
C.	Glottis	(iii)	'U' shaped structure emerging from the stomach
D.	Caecum	(iv)	Opening of wind pipe

Digestion and Absorption Test - 63

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Digestion and Absorption Test - 63

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Question 1

A - amylase, B - maltase, C - lactase, D - invertase

A - amylase, B - maltase, C - invertase, D - lactase

A - amylase, B - invertase, C - maltase, D - lactase

A - amylase, B - lactase, C - maltase, D - invertase

Solution

Question 2

Small intestine : Proteins $$\overset{Pepsin}{\rightarrow}$$ Amino acids

Stomach : Fats $$\overset{Lipase}{\rightarrow}$$ Micelles

Duodenum : Triglycerides $$\overset{Trypsin}{\rightarrow}$$ Monoglycerides

Small intestine.: Starch $$\overset{\alpha - amylase}{\rightarrow}$$ Disaccharide (maltose)

Solution

Question 3

Action of ptyalin on starch is enhanced

Action of ptyalin on starch is reduced

Action of ptyalin on starch is unaffected

Action of ptyalin on starch stops.

Solution

Question 4

mouth, stomach

stomach, small intestine

stomach, mouth

stomach, stomach

Solution

Question 5

A-(i), B-(ii), C-(iii), D-(iv)

A-(iv), B-(iii), C-(iv), D-(i)

A-(iii), B-(i), C-(iv), D-(ii)

A-(ii), B-(iv), C-(i), D-(iii)

Solution

Question 6

A-(ii), B-(i), C-(v), D-(iii), E-(iv)

A-(iv), B-(i), C-(v), D-(ii), E-(iii)

A-(i), B-(ii), C-(iii), D-(iv), E-(v)

A-(i), B-(iii), C-(ii), D-(iv), E-(v)

Solution

Question 7

Pancreas

Spleen

Kidney

Liver

Solution

Question 8

Faecal accumulation in the rectum initiates a neural reflex causing an urge for its removal

Irregular bowel movements cause constipation.

In diarrhoea absorption of food is increased.

All of these

Solution

Question 9

Both statements 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 10

The rate of absorption of digested food molecules would be higher, because the digested food would pass more easily through the digestive tract.

Digestion would not be as effective, because there would be fewer cells secreting trypsin (a protein-digesting enzyme).

Humans would have needed to evolve a much longer small intestine to absorb sufficient nutrients from their food.

Humans would not be able to survive, because the digestive tract would be more susceptible to damage.

Solution

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