Digestion and Absorption — Page 5 | NEET Biology

Q41

Kwashiorkor disease is due to:

A protein deficiency not accompanied by calorie deficiency.

B simultaneous deficiency of proteins and fats.

C simultaneous deficiency of proteins and calories.

D deficiency of carbohydrates.

Correct Answer

Option A

Solution

(a) Kwashiorkor is severe protein malnutrition but unaccompanied by calorie deficiency.

Q42

Where do certain symbiotic micro-organisms normally occur in human body?

A Caecum

B Oral lining and tongue surface

C Vermiform appendix and rectum

D Duodenum

Correct Answer

Option A

Solution

(a) The caecum hosts some symbiotic micro-organisms.

Q43

The primary dentition in human differs from permanent dentition in not having one of the following type of teeth :

A Premolars

B Molars

C Incisors

D Canine

Correct Answer

Option A

Solution

(a) The dental formula for milk teeth is 21022102, so premolars are absent in the primary dentition.

Q44

Lysozyme present in perspiration, saliva and tears destroys

A certain types of bacteria

B all viruses

C most virus-infected cells

D certain fungi

Correct Answer

Option A

Solution

(a) Lysozyme is an antibacterial agent that destroys certain types of bacteria.

Q45

A person who is on a hunger strike surviving only on water, will have

A less amino acids in his urine

B more glucose in his blood

C less urea in his urine

D more sodium in his urine.

Correct Answer

Option C

Solution

(c) During fasting, protein breakdown decreases, leading to less urea in urine.

Q46

Which one of the following is the correct matching of the site of action, enzyme and end product?

A Duodenum: Triglycerides - Monoglycerides

B Small intestine: Starch - Disaccharide (Maltose)

C Small intestine: Proteins - Amino acids

D Stomach: Bile - Micelles

Correct Answer

Option B

Solution

(b) Small intestine - Starch - disaccharide (maltose) via pancreatic amylase.

Q47

Select the correct match of the digested products with their absorption site and mechanism

A Fructose, Na+ Small intestine, passive absorption

B Glycerol, fatty acids Duodenum, move as chylomicrons

C Cholesterol, maltose Small intestine, active absorption

D Glycine, glucose Small intestine, active absorption

Correct Answer

Option D

Solution

(d) Glucose, fructose, fatty acids, amino acids (Glycine etc.) are absorbed through mucosa into blood by active absorption.

Q48

Fructose is absorbed into the blood through mucosa cells of intestine by the process called:

A active transport

B facilitated transport

C simple diffusion

D co-transport mechanism

Correct Answer

Option B

Solution

(b) Facilitated transport moves materials across the plasma membrane by a transport protein down their concentration gradient.

Q49

The initial step in the digestion of milk in humans is carried out by

A Lipase

B Trypsin

C Rennin

D Pepsin

Correct Answer

Option C

Solution

(c) Rennin coagulates milk by converting caseinogen to casein. The initial step in milk digestion is by rennin.

Q50

Gastric juice of infants contains :

A nuclease, pepsinogen, lipase

B pepsinogen, lipase, rennin

C amylase, rennin, pepsinogen

D maltase, pepsinogen, rennin

Correct Answer

Option B

Solution

(b) Gastric juice of infants contains pepsinogen, lipase and rennin.