Biology Test on Digestion

1. Draw a diagram of a villus in vertical section.
(Total 5 marks)

2. Draw a diagram of the human digestive system.
(Total 4 marks)

3. Describe the role of enzymes in the process of digestion of proteins, carbohydrates and lipids in humans.
(Total 6 marks)

4. Draw a labelled diagram of the digestive system.
(Total 5 marks)

5. State the sources, substrate, product, and optimum pH conditions for the enzyme amylase.
(Total 4 marks)

6. Describe the role of enzymes in digestion with reference to two named examples.
(Total 5 marks)

7. What sequence of organs do substances pass through, as they move through the human digestive system?
A. Mouth ® stomach ® pancreas ® small intestine ® liver ® large intestine ® anus
B. Mouth ® stomach ® small intestine ® pancreas ® liver ® large intestine ® anus
C. Mouth ® esophagus ® stomach ® small intestine ® large intestine ® anus
D. Mouth ® esophagus ® stomach ® large intestine ® small intestine ® anus
(Total 1 mark)

8. Dietary factors are known to influence the incidence of colon cancer. The graphs below show the correlation between meat consumption (eating meat) and colon cancer in sample countries and the correlation between fat consumption and colon cancer.

[Source: B Armstrong and R Doll, Environmental factors and cancer incidence and mortality in different countries, with special reference to dietary practices, (1975), International J Cancer, 15, pp 617–631]

[Source: http:members.aol.com/wantnomeat/page] (a) (i) State the relationship between daily meat consumption and the incidence of colon cancer in women.
..........................................................................................................................
(1)

(ii) Using the data in the two graphs opposite, suggest reasons for the relationship between daily meat consumption and the incidence of colon cancer in women.