page 11 15. Four students carried out an experiment to measure the glucose concentration of a carton of fruit juice. Each student measured the values four times. The table shows the readings obtained. Student Concentrations of glucose measured (mg/100 ml) Mean (mg/100 ml) 1 10 16 8 18 13 2 15 13 12 15 14 3 17 10 12 17 14 4 10 9 10 10 10 The actual concentration of glucose in the fruit juice was 12 mg/100 ml. Which statement best describes the data set? A Accurate, but not precise B Precise, but not accurate C Accurate and precise D Neither accurate or precise 16. The figure shows some of the stages in the life cycle of the malarial parasite, Plasmodium. Which of the four stages described is a gametocyte? Stage A enters human bloodstream when bitten by infected mosquito Reproduces asexually in liver cells to form Stage B which then penetrates red blood cells Stage C formed inside red blood cells and released into bloodstream when red blood cells burst Taken up by another mosquito and forms Stage D. Sexual reproduction occurs leading to formation of Stage A which moves to the salivary glands of the mosquito [Turn over