10th class Biology, Chapter 1: Human Digestive System MCQs

1. The three portions of the small intestine, in the correct order, are:

1. (A) Duodenum, jejunum, ileum ✓
2. (B) Ileum, duodenum, jejunum
3. (C) Colon, caecum, rectum
4. (D) Caecum, colon, rectum

2. The wavelike movement of muscles that pushes food through the digestive system is called:

1. (A) Chemical digestion
2. (B) Mechanical digestion
3. (C) Peristalsis ✓
4. (D) Absorption

3. The part of the digestive system where no chemical digestion takes place is:

1. (A) Oral cavity
2. (B) Oesophagus ✓
3. (C) Stomach
4. (D) Duodenum

4. Which group of enzymes breaks up starches?

1. (A) Proteases
2. (B) Lipases
3. (C) Amylases ✓
4. (D) Pepsin

5. The pancreas produces digestive enzymes and releases them into:

1. (A) Colon
2. (B) Gall bladder
3. (C) Liver
4. (D) Duodenum ✓

6. In stomach, pepsinogen is converted into pepsin by the action of:

1. (A) Bile salts
2. (B) Hormones
3. (C) HCl ✓
4. (D) Bicarbonate

7. In which part are the carbohydrates, lipids and proteins digested?

1. (A) Oral cavity
2. (B) Stomach
3. (C) Small intestine ✓
4. (D) Large intestine

8. The enzyme trypsin is found in:

1. (A) Pancreatic juice ✓
2. (B) Bile
3. (C) Gastric juice
4. (D) Saliva

9. The common bile duct carries bile from gall bladder to:

1. (A) Stomach
2. (B) Duodenum ✓
3. (C) Colon
4. (D) Pancreas

10. Why the small intestine has many folds and contains villi and microvilli?

1. (A) To slow down the passage of food.
2. (B) To promote food absorption. ✓
3. (C) To prevent the backflow of chyme.
4. (D) To produce enzymes.

11. The part of the stomach just after the oesophagus is called:

1. (A) Pyloric end
2. (B) Body
3. (C) Cardiac end ✓
4. (D) Fundus

12. Taking in food and drinks through the mouth is called:

1. (A) Digestion
2. (B) Absorption
3. (C) Egestion
4. (D) Ingestion ✓

13. Using the absorbed nutrients in cells and tissues is called:

1. (A) Ingestion
2. (B) Egestion
3. (C) Assimilation ✓
4. (D) Absorption

14. Removing undigested food and waste from the body is called:

1. (A) Digestion
2. (B) Absorption
3. (C) Egestion ✓
4. (D) Assimilation

15. Animals, including humans, cannot make their own food. Their mode of nutrition is:

1. (A) Autotrophic
2. (B) Photosynthetic
3. (C) Chemosynthetic
4. (D) Heterotrophic ✓

16. Breaking large food polymers into small soluble monomers is called:

1. (A) Emulsification
2. (B) Digestion ✓
3. (C) Assimilation
4. (D) Egestion

17. Salivary amylase breaks down starch into:

1. (A) Fatty acids
2. (B) Maltose ✓
3. (C) Glucose
4. (D) Peptides

18. How many pairs of salivary glands are attached with the oral cavity?

1. (A) One
2. (B) Three ✓
3. (C) Two
4. (D) Four

19. The elastic cartilage that prevents the entry of food into the trachea is:

1. (A) Palate
2. (B) Pharynx
3. (C) Epiglottis ✓
4. (D) Glottis

20. The oesophagus is about:

1. (A) 25 cm long ✓
2. (B) 7 m long
3. (C) 2.5 m long
4. (D) 4 m long