Paper 1 H - SAMPLE SET 1 Q8
8) Figure 8 shows a cross-section through a plant root.
8.1) What is tissue A? [1 mark]
8.2) A student is given samples of two fluids.
One fluid is from the phloem of a plant and one from the xylem of a plant.
The student is asked to work out which fluid is from the phloem and which is from the xylem.
She measures the pH and the concentrations of sugar, nitrate ions and potassium ions of each fluid.
Table 4 shows the student’s results.
8.2) A student is given samples of two fluids.
One fluid is from the phloem of a plant and one from the xylem of a plant.
The student is asked to work out which fluid is from the phloem and which is from the xylem.
She measures the pH and the concentrations of sugar, nitrate ions and potassium ions of each fluid.
Table 4 shows the student’s results.
Which fluid is from the phloem, and which is from the xylem?
Explain your answer.
Use the information from Table 4. [4 marks]
8.3) In fluid A, how many times greater is the concentration of sugar than the concentration of potassium ions? [2 marks]
8.4) The concentration of potassium ions in the soil is 3.9 μg/cm3
The concentration of potassium ions in the root tissue is 2500 μg/cm3
Explain why the concentration is so much higher in the roots than in the soil. [3 marks]
(Total for Question 8 = 10 marks)
Explain your answer.
Use the information from Table 4. [4 marks]
8.3) In fluid A, how many times greater is the concentration of sugar than the concentration of potassium ions? [2 marks]
8.4) The concentration of potassium ions in the soil is 3.9 μg/cm3
The concentration of potassium ions in the root tissue is 2500 μg/cm3
Explain why the concentration is so much higher in the roots than in the soil. [3 marks]
(Total for Question 8 = 10 marks)