05 Nutrition in Humans Worksheet

21 Biology Worksheet Chapter 6: Nutrition in Humans Name: _________________________ ( ) Class : _________ Date : _________ Section A Multiple Choice Questions Choose the most appropriate answer and write it in the corresponding box below. Qn 1 2 3 4 5 6 7 8 9 10 Ans Qn 11 12 13 14 15 16 Ans 1 Which of the following curves best represents the change in the glucose level of blood flowing through the following organs of a man who has starved for eight hours? 
 2 The acidic liquid in the stomach contains ________. A pepsin and mucus C maltase and pepsin B bile and pepsinogen D lipase and trypsin 3 If the pancreatic duct of a mammal became blocked, which symptom would the animal show? A increased bile in the blood C decreased blood insulin level B increased blood sugar level D decreased protein digestion 4 Pancreatic juice contains enzymes, which digest ________. 8 A proteins and carbohydrates C fats and carbohydrates B proteins and fats D proteins, fats and carbohydrates

22 5 The secretions listed below are all active in the mammalian alimentary canal. (1) Saliva (2) Gastric juice (3) Bile (4) Pancreatic juice (5) Intestinal juice Which secretions contain the enzyme amylase? A 1 only C 1 and 4 only B 2 only D 1 and 5 only 6 What would happen if a person’s bile duct became blocked? A Fat digestion would be reduced. B Fat digestion would stop. C Manufacture of bile would stop. D Protein digestion would stop. 7 Which region of the alimentary canal has the greatest surface area for absorption of food molecules? A colon C ileum B duodenum D stomach 8 The diagram shows the effect of pH on the activity of two enzymes in the human gut. In which regions of the alimentary canal would these enzymes be most active? Protease Amylase A colon stomach B duodenum colon C duodenum stomach D stomach duodenum 9 The diagram shows the structure of a villus in the small intestine. The arrows show the direction of flow of fluids. After a meal of fried chicken, where will fats be present in the largest amounts?

23 10 The diagram shows some food moving along the alimentary canal, by peristalsis. In which state are the muscles in the wall of the alimentary canal at point X? circular muscles longitudinal muscles A B C D contracting contracting relaxing relaxing contracting relaxing contracting relaxing 11 The diagram shows the blood supply to the liver and gut. What are X, Y and Z? artery portal vein vein A X Y Z B Y Z X C Z X Y D Y X Z 12 Where in the alimentary canal is most water absorbed? A colon B ileum C oesophagus D stomach

24 13 Five tubes containing cooked egg-white are set up as shown. Protease solutions of different pH are added to each tube. Which diagram shows the result