1. Credit level problem solving revision Try to answer the questions on paper first then move on to the answers to find out how you got on.

3. 1254:114:1.2 In ratios, always try to simplify the numbers by the smallest number, in this case divide by 1.2 1254/1.2 = 1045, 114/1.2 = 95, 1.2/1.2 = 1 1045 95 1 Whole numbers – ratios cannot be shown with numbers that have a decimal place. 1.2 cm 3 urine per minute. For 24 hours this would be 1.2 x 60 = 72 cm 3 per hour, 72 x 24 = 1728cm 3 per 24hours. 1728/100 cm 3 = 17.28 x 1.75g = 30.24g urea per 100cm 3 urine. 30.24 Don’t round up too soon – leave your answer to one or two decimal places if this is what they have used in the question.

5. The diameter is the length from one side of the circle to the other. This is 2mm. 2mm/ 5 cells = the length of the cell is 0.4mm 2mm/ 10 cells = the width of the cell is 0.2mm 0.4 0.2

7. Use the formula you are given: Energy content (kJ) = temp rise (30) x 0.21 30x0.21 = 6.3kJ per gram 6.3

9. There are 3 diagnoses that are not pink. Could be inflammation or infection Only one answer not pink but high viscosity Go to 3 Normal High cloudiness Slight cloudiness Inflammation Take care to match with the answer provided.

11. You must mention both variables in your answer: As boron concentration increases, the length of young trout increases. 1 micromole = 15 mm 10 micromoles = 16.2mm Use formula – change/original x 100 Change = 1.2mm. Original length = 15mm 1.2/15 x 100 = 8% 8

13. You will be marked on your labels, units and plot points/neat line.