Digestive & Respiratory System MCQ Quiz – Part 1
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This Digestive & Respiratory System MCQ Quiz helps aspirants revise important concepts related to the structure and functions of the human digestive and respiratory systems, which are frequently asked in competitive exams. Regular practice of these MCQs improves conceptual understanding and helps candidates answer biology questions quickly and accurately.
GK Series – Biology – Digestive & Respiratory System MCQ Quiz |
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| Subject | Biology |
| Chapter | Digestive & Respiratory System |
| Part | 1 |
| Questions | 25 |
Who Should Attempt This Digestive & Respiratory System MCQ Quiz?
This Digestive & Respiratory System MCQ Quiz is useful for aspirants preparing for SSC, Railways, Banking, Defence, and other government job exams, where basic biology questions are commonly asked in the General Knowledge section.
Topics Covered in This Digestive & Respiratory System MCQ Quiz
This quiz includes MCQs based on important topics such as organs of the digestive system, digestion and absorption of food, structure and functions of the respiratory system, breathing mechanism, and gas exchange, along with other fundamental concepts related to human digestion and respiration.
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Question 1 of 25
1. Question
Digestion is the process of
Correct
➤ Digestion is the process of breaking down complex food into simpler substances.
➤ These simpler nutrients are absorbed and used by the body.Incorrect
➤ Digestion is the process of breaking down complex food into simpler substances.
➤ These simpler nutrients are absorbed and used by the body. -
Question 2 of 25
2. Question
Digestion in humans begins in the
Correct
➤ Digestion begins in the mouth (oral cavity).
➤ Teeth perform mechanical digestion by chewing food.Incorrect
➤ Digestion begins in the mouth (oral cavity).
➤ Teeth perform mechanical digestion by chewing food. -
Question 3 of 25
3. Question
Which enzyme present in saliva helps digest starch?
Correct
➤ Salivary amylase is present in saliva.
➤ It breaks down starch (complex carbohydrate) into simpler sugars.Incorrect
➤ Salivary amylase is present in saliva.
➤ It breaks down starch (complex carbohydrate) into simpler sugars. -
Question 4 of 25
4. Question
The tongue mainly helps in
Correct
➤ The tongue mixes food with saliva.
➤ It also helps in swallowing the food.Incorrect
➤ The tongue mixes food with saliva.
➤ It also helps in swallowing the food. -
Question 5 of 25
5. Question
The pharynx connects the mouth to the
Correct
➤ Pharynx is a common passage for food and air.
➤ It connects the mouth to the esophagus.Incorrect
➤ Pharynx is a common passage for food and air.
➤ It connects the mouth to the esophagus. -
Question 6 of 25
6. Question
The esophagus moves food toward the stomach by
Correct
➤ Peristalsis is a wave-like muscular movement.
➤ It pushes food through the esophagus toward the stomach.Incorrect
➤ Peristalsis is a wave-like muscular movement.
➤ It pushes food through the esophagus toward the stomach. -
Question 7 of 25
7. Question
The approximate length of the esophagus in humans is
Correct
➤ The esophagus is a muscular tube about 25 cm long.
➤ It connects the pharynx to the stomach.Incorrect
➤ The esophagus is a muscular tube about 25 cm long.
➤ It connects the pharynx to the stomach. -
Question 8 of 25
8. Question
The stomach is a
Correct
➤ The stomach is a J-shaped muscular organ.
➤ It plays a key role in chemical digestion of food.Incorrect
➤ The stomach is a J-shaped muscular organ.
➤ It plays a key role in chemical digestion of food. -
Question 9 of 25
9. Question
Which acid is present in gastric juice of the stomach?
Correct
➤ Hydrochloric acid (HCl) is present in gastric juice.
➤ It kills germs and provides an acidic medium for enzyme action.Incorrect
➤ Hydrochloric acid (HCl) is present in gastric juice.
➤ It kills germs and provides an acidic medium for enzyme action. -
Question 10 of 25
10. Question
Which enzyme digests proteins in the stomach?
Correct
➤ Pepsin is the main protein-digesting enzyme of the stomach.
➤ It works only in an acidic medium provided by HCl.Incorrect
➤ Pepsin is the main protein-digesting enzyme of the stomach.
➤ It works only in an acidic medium provided by HCl. -
Question 11 of 25
11. Question
Which substance protects the stomach lining from the action of acid?
Correct
➤ Mucus is secreted in the stomach lining.
➤ It protects the delicate stomach wall from hydrochloric acid and digestive enzymes.Incorrect
➤ Mucus is secreted in the stomach lining.
➤ It protects the delicate stomach wall from hydrochloric acid and digestive enzymes. -
Question 12 of 25
12. Question
The muscular valve that controls the passage of food from stomach to small intestine is called
Correct
➤ Sphincter muscles regulate the movement of food between digestive organs.
➤ They allow food to pass from the stomach into the small intestine.Incorrect
➤ Sphincter muscles regulate the movement of food between digestive organs.
➤ They allow food to pass from the stomach into the small intestine. -
Question 13 of 25
13. Question
The longest part of the human alimentary canal is the
Correct
➤ Small intestine is the longest part of the alimentary canal.
➤ Its length is approximately 6.5–7.5 meters.Incorrect
➤ Small intestine is the longest part of the alimentary canal.
➤ Its length is approximately 6.5–7.5 meters. -
Question 14 of 25
14. Question
The main site of digestion and absorption in the digestive system is
Correct
➤ Most digestion and nutrient absorption occur in the small intestine.
➤ It contains villi which increase surface area for absorption.Incorrect
➤ Most digestion and nutrient absorption occur in the small intestine.
➤ It contains villi which increase surface area for absorption. -
Question 15 of 25
15. Question
Which is the first part of the small intestine?
Correct
➤ Duodenum is the first part of the small intestine.
➤ It receives bile juice and pancreatic juice for digestion.Incorrect
➤ Duodenum is the first part of the small intestine.
➤ It receives bile juice and pancreatic juice for digestion. -
Question 16 of 25
16. Question
The middle part of the small intestine is called
Correct
➤ Jejunum is the middle section of the small intestine.
➤ It plays an important role in nutrient absorption.Incorrect
➤ Jejunum is the middle section of the small intestine.
➤ It plays an important role in nutrient absorption. -
Question 17 of 25
17. Question
The last part of the small intestine is
Correct
➤ Ileum is the final part of the small intestine.
➤ It connects the small intestine to the large intestine.Incorrect
➤ Ileum is the final part of the small intestine.
➤ It connects the small intestine to the large intestine. -
Question 18 of 25
18. Question
The pancreas secretes digestive juice called
Correct
➤ Pancreas releases pancreatic juice into the small intestine.
➤ This juice contains several digestive enzymes.Incorrect
➤ Pancreas releases pancreatic juice into the small intestine.
➤ This juice contains several digestive enzymes. -
Question 19 of 25
19. Question
Which pancreatic enzyme digests carbohydrates?
Correct
➤ Pancreatic amylase digests carbohydrates.
➤ It breaks complex carbohydrates into simpler sugars.Incorrect
➤ Pancreatic amylase digests carbohydrates.
➤ It breaks complex carbohydrates into simpler sugars. -
Question 20 of 25
20. Question
Which pancreatic enzyme digests fats into fatty acids and glycerol?
Correct
➤ Lipase is the enzyme responsible for fat digestion.
➤ It breaks fats into fatty acids and glycerol.Incorrect
➤ Lipase is the enzyme responsible for fat digestion.
➤ It breaks fats into fatty acids and glycerol. -
Question 21 of 25
21. Question
Which pancreatic enzyme digests proteins into amino acids?
Correct
➤ Trypsin is a protein-digesting enzyme secreted by the pancreas.
➤ It works in a basic medium inside the small intestine.Incorrect
➤ Trypsin is a protein-digesting enzyme secreted by the pancreas.
➤ It works in a basic medium inside the small intestine. -
Question 22 of 25
22. Question
Bile juice is produced by the
Correct
➤ Bile juice is produced by the liver.
➤ It plays an important role in fat digestion.Incorrect
➤ Bile juice is produced by the liver.
➤ It plays an important role in fat digestion. -
Question 23 of 25
23. Question
Bile juice is stored in the
Correct
➤ Bile juice is stored in the gall bladder.
➤ It is released into the small intestine during digestion.Incorrect
➤ Bile juice is stored in the gall bladder.
➤ It is released into the small intestine during digestion. -
Question 24 of 25
24. Question
Bile juice is
Correct
➤ Bile is not an enzyme but a digestive fluid.
➤ It helps in fat digestion and maintaining proper pH.Incorrect
➤ Bile is not an enzyme but a digestive fluid.
➤ It helps in fat digestion and maintaining proper pH. -
Question 25 of 25
25. Question
The nature of bile juice is
Correct
➤ Bile juice is alkaline in nature.
➤ It neutralizes acidic chyme coming from the stomach.Incorrect
➤ Bile juice is alkaline in nature.
➤ It neutralizes acidic chyme coming from the stomach.