11th Class Biology Unit 9 Human Digestive System MCQs

1.Where does chemical digestion of carbohydrates begin?

2.Which enzyme in saliva starts breaking down starch?

3.What prevents food from entering the trachea during swallowing?

4.Why does the enzyme activity drops in the stomach when pH rises?

5.Which change would most affect protein digestion?

6.Why is lipase not active in the stomach?

7.Which stomach secretion activates pepsin and kills bacteria?

8.Why is segmentation important in the small intestine?

9.What is the function of villi and microvilli in the small intestine?

10.Which best explains the liver's role in digestion?

11.The GI tract is a continuous tube that extends from:

12.Which of the following help to retain food in oral cavity?

13.Muscular tongue plays its role in selection of food through:

14.Mastication is a type of:

15.How many pairs of salivary glands are present in man?

16.Fresh saliva has pH of:

17.In oral cavity the food mass is in the form of a small moist mass called:

18.Which salivary glands are present in front of ears:

19.Saliva contains enzyme called as:

20.Entry of bolus into trachea is prevented by:

21.Food moves down through the oesophagus to the stomach by:

22.Which sphincter is present between oesophagus and stomach:

23.Which movement results in the mixing of digestive secretion with food:

24.Antiperistalsis is also called:

25.Which portion of stomach is present immediately after oesophagus:

26.Which is not part of stomach:

27.How many layers of smooth muscles are present in stomach wall?

28.Gastric glands are present in:

29.HCl is secreted by:

30.Pepsinogen is activated by:

31.The semi solid acidic mass of stomach after three to four hours of a meal is called:

32.Chyme is released into small intestine through:

33.Secretion of gastric juice is regulated by:

34.Which of the following hormone is secreted by stomach?

35.Which hormone stops the secretion of hydrochloric acid:

36.pH of pancreatic juice is slightly alkaline due to presence of:

37.Trypsinogen is activated to trypsin by:

38.Pancreatic nucleases digest:

39.Bile before secretion is stored in:

40.Dipeptides are digested to amino acids by:

41.Enzymes of intestinal juice convert chyme into:

42.For absorption of food each villus is richly supplied with blood capillaries and:

43.Microvilli are:

44.Hepatic portal vein carries sugar and proteins to:

45.Chylomicrons are triglycerides coated with:

46.Large intestine is involved in absorption of which vitamin:

47.Vermiform appendix arises for:

48.Next to the caecum is:

49.At its distal end rectum opens out through:

50.Anus is surrounded by how many sphincters:

51.Which bacteria live and actively divide in colon:

52.In infants control of egestion is:

53.Emulsification of fats is done by:

54.Pancreatic juice is secreted by which part of pancreas:

55.Endocrine portion of pancreas secretes:

56.Which hormone are secreted by duodenal walls:

57.Liver converts excess glucose into:

58.Urea is synthesized in:

Unit 9: Unit 9: Human Digestive System — Mcqs