Digestive system

9.Which structure in the small intestine increases surface area for absorption?

10.A student investigates the effect of pH on the activity of the enzyme protease. Which pH would you expect to give the highest rate of reaction?

11.Which part of the digestive system is labelled A in the diagram?

12.What is the function of the part labelled C in the diagram?

13.Which organ produces bile?

14.What is the function of the gall bladder?

16.A student adds 2 cm³ of starch solution to 2 cm³ of amylase solution at pH 7 and 37°C. Every 30 seconds, they test a drop of the mixture with iodine solution. The iodine turns from blue-black to orange-brown after 90 seconds. What does this indicate?

17.Which graph best shows the effect of temperature on the rate of an enzyme-controlled reaction?

18.A student investigates the digestion of protein by protease at different pH values. The results show the time taken for the protein to be fully digested. Which pH gives the fastest digestion?

19.Which enzyme breaks down lipids?

20.The diagram shows the digestive system. Which labelled part is the pancreas?

21.In the diagram of the digestive system, which part is the small intestine?

22.A student sets up three test tubes: Tube 1 contains starch and amylase at pH 7; Tube 2 contains starch and boiled amylase at pH 7; Tube 3 contains starch and amylase at pH 3. After 10 minutes at 37°C, iodine solution is added. Which tube(s) will turn blue-black?

23.A food sample is tested with Benedict's reagent and heated. The colour changes from blue to orange. What does this indicate?

24.A student wants to investigate the effect of pH on the digestion of starch by amylase. Which of the following is the most appropriate method?

25.A student investigates the effect of temperature on the digestion of starch by amylase. They add 2 cm³ of starch solution to 2 cm³ of amylase solution at pH 7. They place the mixture in a water bath at 20°C, 30°C, 40°C, 50°C, and 60°C. Every 30 seconds they test a drop of the mixture with iodine solution. Which of the following is the independent variable in this experiment?

26.A student wants to test for the presence of protein in a food sample. Which reagent should they use, and what colour indicates a positive result?

27.In an experiment, a student adds 2 cm³ of starch solution to 2 cm³ of amylase solution at pH 7 and 37°C. Every 30 seconds, they test a drop of the mixture with iodine solution. The iodine solution turns blue-black for the first 2 minutes, then remains orange. What conclusion can be drawn?

28.A student sets up three test tubes: Tube 1 contains starch and amylase at pH 7; Tube 2 contains starch and boiled amylase at pH 7; Tube 3 contains starch and amylase at pH 2. After 10 minutes at 37°C, they add iodine solution. Which tube(s) will show a blue-black colour?

29.Which of the following is the correct order of organs through which food passes?

30.A student investigates the effect of pH on the activity of the enzyme protease. They use a protein solution and measure the time taken for the protein to be fully digested at different pH values. The results show that the fastest digestion occurs at pH 2. Which of the following is the most likely explanation?

31.Which of the following is NOT a function of the liver in digestion?

32.Which of the following correctly matches an organ with its function?

33.A student investigates the digestion of starch by amylase. They set up four test tubes at 37°C: Tube A: starch + amylase + buffer pH 7; Tube B: starch + amylase + buffer pH 5; Tube C: starch + amylase + buffer pH 9; Tube D: starch + water + buffer pH 7. After 10 minutes, they test each tube with iodine solution. Which tube is the control?

34.Which organ of the digestive system contains hydrochloric acid that kills bacteria?

35.Digested food is absorbed into the bloodstream in which organ?

36.Bile is produced in the liver. What is its role in digestion?

37.Where in the digestive system are villi found?

38.In which organ is water absorbed from the undigested food?

39.Which of the following correctly pairs an organ with its function?

40.The large intestine is where water is absorbed from undigested food.

41.Match each organ to its correct function.

42.Place the following organs in the order that food passes through them, starting from the mouth.

43.Which of the following describes the role of bile in digestion?

44.The pancreas produces the enzymes protease, amylase and lipase.

45.Which of the following organs are involved in mechanical breakdown of food? (Select all that apply)

46.Where do bacteria that help with digestion mainly live?

47.Arrange the following organs in the order that food passes through them, starting from the mouth.

48.Which of the following organs produce enzymes that digest food? (Select all that apply)

49.Bile is produced in the gall bladder.

50.Complete the sentence.

51.State the name of the organ where faeces is stored before it leaves the body.

52.Describe the role of enzymes in digestion. Name one specific enzyme and the substance it breaks down.

53.State the name of the organ where digested food is absorbed into the blood.