Home
E-Books
Jobs
News
Results
Competition Exams
Admissions
Generate Test
Make Quiz
mcqs of
,
1 : What makes saliva important for nutrient digestion?
A
:
Contains HCl
B
:
Contains salivary amylase
C
:
Contains bile
D
:
Absorbs vitamins
2 : In case of blocked salivary glands, what process is affected first?
A
:
Protein absorption
B
:
Mechanical digestion
C
:
Chemical digestion in mouth
D
:
Water absorption
3 : Why is proper chewing essential for digestion?
A
:
Enhances oxygen supply
B
:
Stimulates pancreas
C
:
Allows better enzyme action
D
:
Increases protein content
4 : How does the oral cavity help in Immunity?
A
:
Produces red blood cells
B
:
Filters oxygen
C
:
Thiocyanate in saliva kills microbes
D
:
Produces bile
5 : Why is peristalsis important in oesophagus?
A
:
It produces enzymes
B
:
It prevents infection
C
:
It pushes food downward
D
:
It mixes the food
6 : What would happen if the cardiac sphincter failed to close properly?
A
:
Difficulty in chewing
B
:
Food stuck in pharynx
C
:
Acid reflux in oesophagus
D
:
Blocked saliva glands
7 : How does the tongue help in food selection?
A
:
Secretes saliva
B
:
Feels food temperature
C
:
Filters toxins
D
:
Detects taste and texture
8 : Why does fresh saliva have a pH around 8?
A
:
Due to HCl
B
:
Due to thiocyanate
C
:
Due to bicarbonate ions
D
:
Due to amylase
9 : How does the body prevent food from entering the trachea?
A
:
Raising tongue
B
:
Lowering epiglottis
C
:
Closing oesophagus
D
:
Raising the larynx
10 : Why is mastication important for digestion?
A
:
Produces enzymes
B
:
Increases food acidity
C
:
Breaks down proteins
D
:
Increases surface area
11 : Where is the parotid gland located?
A
:
Under tongue
B
:
In front of ears
C
:
Behind jaws
D
:
On the roof of mouth
12 : What is the function of the lower oesophageal sphincter?
A
:
Saliva production
B
:
Nutrient absorption
C
:
Closing nasal cavity
D
:
Preventing backflow
13 : Which part of the digestive system is a shared pathway with the respiratory system?
A
:
Oral cavity
B
:
Pharynx
C
:
Oesophagus
D
:
Trachea
14 : What is the function of the salivary amylase enzyme?
A
:
Protein digestion
B
:
Lipid digestion
C
:
Starch digestion
D
:
Vitamin breakdown
15 : Why is pyloric sphincter necessary?
A
:
To digest food
B
:
To regulate chyme release
C
:
To activate enzymes
D
:
To secrete hormones
16 : Why are three muscle layers in the stomach beneficial?
A
:
Reduce body heat
B
:
Increase surface area
C
:
Aid strong churning of food
D
:
Slow digestion
17 : What is the importance of gastrin?
A
:
Stops gastric juice
B
:
Activates bile
C
:
Stimulates gastric juice
D
:
Absorbs glucose
18 : Which movement is responsible for vomiting?
A
:
Peristalsis
B
:
Segmentation
C
:
Antiperistalsis
D
:
Reflex contraction
19 : What causes the activation of gastric glands before eating?
A
:
Blood pressure
B
:
Smell and sight of food
C
:
Enzyme deficiency
D
:
Hunger pangs
20 : How does HCl assist in protein digestion?
A
:
Breaks proteins directly
B
:
Neutralizes pepsin
C
:
Activates pepsinogen
D
:
Absorbs amino acids
21 : Why is mucus secreted by gastric glands?
A
:
To digest fats
B
:
To protect stomach lining
C
:
To neutralize acid
D
:
To activate enzymes
22 : How does segmentation aid digestion?
A
:
Promotes hormonal secretion
B
:
Increases bile flow
C
:
Mixes food with secretions
D
:
Controls heart rate
23 : Why does peristalsis occur in the alimentary canal?
A
:
To absorb nutrients
B
:
To push food forward
C
:
To store waste
D
:
To increase enzyme activity
24 : What is chyme?
A
:
Undigested residue
B
:
Semi-digested protein
C
:
Semi-liquid acidic food mass
D
:
Intestinal waste
25 : What is the role of parietal cells in gastric glands?
A
:
Secrete enzymes
B
:
Secrete mucus
C
:
Secrete HCl
D
:
Absorb nutrients
26 : Which type of muscle is present in the stomach wall?
A
:
Cardiac
B
:
Smooth
C
:
Skeletal
D
:
Voluntary
27 : What type of movement is segmentation?
A
:
Unidirectional push
B
:
Mixing in place
C
:
Absorption movement
D
:
Secretion-based movement
28 : What is the final fate of chylomicrons in blood?
A
:
Stored in liver
B
:
Digested by blood enzymes
C
:
Used in respiration
D
:
Excreted in urine
29 : What makes chyme into chyle?
A
:
Stomach acid
B
:
Intestinal juice
C
:
Liver secretion
D
:
Hydrochloric acid
30 : What is peristalsis in the alimentary canal?
A
:
Voluntary muscle movement
B
:
Hormonal contraction
C
:
Rhythmic smooth muscle contraction
D
:
Blood flow regulation
31 : Which route do amino acids follow after absorption?
A
:
Lacteal → Thoracic duct
B
:
Vein → Heart
C
:
Hepatic portal vein → Liver
D
:
Artery → Colon
32 : Why are bile salts essential in fat digestion?
A
:
Neutralize chyme
B
:
Activate lipase
C
:
Emulsify fats
D
:
Digest proteins
33 : What happens to excess glucose in liver?
A
:
Excreted
B
:
Stored as glycogen
C
:
Stored as fat
D
:
Converted to protein
34 : What is the role of hepatic portal vein in digestion?
A
:
Stores glucose
B
:
Absorbs fats
C
:
Transports sugars and amino acids to liver
D
:
Produces enzymes
35 : Which enzyme converts maltose to glucose?
A
:
Maltase
B
:
Lactase
C
:
Lipase
D
:
Sucrase
36 : Why does absorption occur mostly in the small intestine?
A
:
Acidic pH
B
:
Smooth walls
C
:
Large surface area
D
:
Presence of HCl
37 : Which feature helps in absorption of fats in villi?
A
:
Capillaries
B
:
Chylomicrons
C
:
Glucose
D
:
Enzyme
38 : How does surface area of small intestine increase?
A
:
Microvilli
B
:
Goblet cells
C
:
Enzymes
D
:
Sphincters
39 : Why is pancreatic juice alkaline in nature?
A
:
Contains water
B
:
Contains enzymes
C
:
Contains HCl
D
:
Contains bicarbonate
40 : Which enzyme in intestinal juice digests lactose?
A
:
Sucrase
B
:
Maltase
C
:
Lactase
D
:
Lipase
41 : Which part of small intestine is longest?
A
:
Duodenum
B
:
Colon
C
:
Ileum
D
:
Jejunum
42 : What is the function of bile in digestion?
A
:
Digests fats
B
:
Emulsifies fats
C
:
Neutralizes acids
D
:
Activates enzymes
43 : Which enzyme activates trypsinogen into trypsin?
A
:
Pepsin
B
:
Enterokinase
C
:
Lipase
D
:
Maltose
44 : What is the length of the small intestine in an adult human?
A
:
2 m
B
:
6 m
C
:
10 m
D
:
3 m
45 : Which part of the small intestine receives secretions from liver and pancreas?
A
:
Jejunum
B
:
Ileum
C
:
Duodenum
D
:
Colon
46 : What reflects the integration of nervous and muscular systems in defecation?
A
:
Reflex contraction of liver
B
:
Hormonal release from stomach
C
:
Voluntary and involuntary sphincters
D
:
Absorption of vitamins
47 : Which statement best explains egestion in infants?
A
:
Controlled by brain
B
:
Under voluntary control
C
:
Mediated by spinal reflex
D
:
Depends on hunger
48 : What shows the development of voluntary control in defecation?
A
:
Maturation of pancreas
B
:
Functioning of spinal cord
C
:
Development of cerebral cortex
D
:
Secretation of bile
49 : Why is vitamin K important for the human body?
A
:
It helps in fat digestion
B
:
It strengthens bones
C
:
It aids blood clotting
D
:
It boosts immunity
50 : What would happen if the large intestine failed to absorb water?
A
:
Increased vitamin absorption
B
:
Constipation
C
:
Diarrhoea
D
:
Nutrient overload
51 : Why is the appendix called vestigial in humans?
A
:
It stores vitamins
B
:
It produces enzymes
C
:
It has lost its original function
D
:
It digests cellulose
52 : Which part of large intestine is involved in initiating defecation reflex?
A
:
Appendix
B
:
Cecum
C
:
Colon
D
:
Rectum
53 : What is the role of E. coli in the colon?
A
:
Breaking lipid
B
:
Producing vitamins
C
:
Absorbing glucose
D
:
Forming mucus
54 : How does the body prevent defecation in adults when socially inappropriate?
A
:
By relaxing colon muscles
B
:
Voluntary control of external sphincter
C
:
Increasing bile secretion
D
:
Stopping peristalsis
55 : Why is there no villi in the large intestine?
A
:
Villi would block water absorption
B
:
Enzymes are present instead
C
:
Absorption is limited to water and salts
D
:
Digestion occurs only here
56 : Where is feces stored temporarily?
A
:
Cecum
B
:
Colon
C
:
Ileum
D
:
Rectum
57 : What are feces mainly composed of?
A
:
Digested proteins
B
:
Digestive enzymes
C
:
Indigestible matter and bacteria
D
:
Pure water
58 : What is the vermiform appendix?
A
:
A gland in the colon
B
:
Enzyme secreted by cecum
C
:
Vestigial finger-like structure
D
:
Fold in the rectum
59 : What is the function of the colon?
A
:
Secreting enzymes
B
:
Absorbing water
C
:
Digesting fats
D
:
Breaking proteins
60 : Which part of the alimentary canal absorbs water and vitamin K?
A
:
Small Intestine
B
:
Large Intestine
C
:
Stomach
D
:
Pancreas
61 : Why is the storage of vitamins in liver important?
A
:
For long-term protein digestion
B
:
For emergency use and body repair
C
:
To reduce fat digestion
D
:
To aid in bile production
62 : How does liver support body energy need between meals?
A
:
Breaks down DNA
B
:
Absorbs more glucose
C
:
Releases stored glycogen
D
:
Activates bile salts
63 : What is the effect of blocked bile duct?
A
:
Reduced enzyme activity
B
:
Bile accumulates in gallbladder
C
:
Pancreas stops working
D
:
Liver fails to store glycogen
64 : Why is CCK secretion beneficial during digestion?
A
:
Stimulates gastric emptying
B
:
Inhibits insulin release
C
:
Enhances bile and enzyme release
D
:
Promotes bile reabsorption
65 : What might happen if liver fails to convert ammonia to urea?
A
:
Bile overproduction
B
:
Nutrient deficiency
C
:
Ammonia toxicity
D
:
Water loss
66 : Which function is shared by liver and pancreas?
A
:
Absorbing nutrients
B
:
Storing vitamins
C
:
Releasing digestive enzymes
D
:
Hormonal secretion
67 : How does the liver manage excess glucose?
A
:
Excretes it through urine
B
:
Stores it as glycogen
C
:
Converts it to amino acids
D
:
Breaks it into fatty acids
68 : Why is pancreas considered both endocrine and exocrine gland?
A
:
It secretes both mucus and hormones
B
:
It has ducts and also releases into blood
C
:
It works with stomach
D
:
It stores bile
69 : How does secretin affect the digestive system?
A
:
Triggers gastric acid release
B
:
Stimulates bile storage
C
:
Promotes pancreatic juice secretion
D
:
Inhibits enzyme action
70 : Why is bile important for fat digestion?
A
:
It digests fat directly
B
:
It emulsifies fats for enzyme action
C
:
It breaks protein
D
:
It activates trypsin
71 : What hormone stimulates gallbladder to release bile?
A
:
Gastrin
B
:
CCK
C
:
Insulin
D
:
Secretin
72 : Which part of pancreas releases hormones like insulin?
A
:
Exocrine part
B
:
Liver lobule
C
:
Ducted portion
D
:
Endocrine part
73 : What kind of enzymes are found in pancreatic juice?
A
:
Only protein-digesting enzymes
B
:
Only carbohydrate-digesting enzymes
C
:
Enzymes for all food groups
D
:
Only fat-digesting enzymes
74 : What is the main function of the gallbladder?
A
:
Produces enzymes
B
:
Stores and concentrates bile
C
:
Secretes insulin
D
:
Absorbs nutrients
75 : Which organ produces bile that aids in fat digestion?
A
:
Pancreas
B
:
Gallbladder
C
:
Liver
D
:
Stomach
76 : Which structure connects the pharynx to the stomach?
A
:
Trachea
B
:
Oesophagus
C
:
Larynx
D
:
Epiglottis
77 : What stops acid secretion when food leaves stomach?
A
:
Gastrin
B
:
Somatostatin
C
:
Pepsin
D
:
HCl
Chapter 9 : Human Digestive System
Biology 11th MCQs || Ilam Ghar
Biology 11th