5.1.1 Describe and explain the results shown in Table 5.1 (3)

5.3 The cholera bacterium can survive in the small intestine and the large intestine. The bacterium releases a toxin that interacts with receptors on the surface of cells. Fig. 5.3 shows the effect of the toxin. The arrows indicate the direction of movement.     Right-click on the blue button to open Fig. 5.3       5.3.1 State the name of ion X. (1)

6.1.2 Explain the mechanism that is responsible for the movement of water in xylem vessels. (4)

5.3.2 Describe the effects on the body of the secretion of ion X into the lumen of the intestine. (4)

1.3.2 Many countries have laws that ban smoking in public buildings. Discuss the evidence from Table 1.1 that supports these laws. (3)

2.1.2 State the name of the process by which oxygen is transferred from fluid B to the cells. (1)

3. One of the characteristics of living organisms is sensitivity   3.1 Define the term sensitivity. (2)

  TOTAL QUESTION 4 [12]

  TOTAL QUESTION 5 [15]

4.1 Describe the similarities and differences between marasmus and kwashiorkor. (4)   similarities…………………………… differences………………………….