3.4 Xylem
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What does xylem transport?
(1)Total for this question: 1 mark
3(h) TRANSPORT · EXAM QUESTIONS
3.4 Xylem
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3.4 Xylem
Exam question
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Which statement about xylem vessels is correct?
(1)Total for this question: 1 mark
3.4 Xylem
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Explain how the structure of xylem vessels helps them transport water.
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Total for this question: 2 marks
3.4 Xylem
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Explain why lignin in xylem walls is important.
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Total for this question: 2 marks
3.4 Xylem
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Describe the route of water from the soil to a leaf cell.
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Total for this question: 3 marks
3.4 Xylem
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A celery stalk is stood in water containing blue dye. Describe how this could show where the xylem is.
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Total for this question: 2 marks
3.4 Xylem
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Explain why the dye in the celery stalk moves upwards.
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Total for this question: 2 marks
3.4 Xylem
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Dye moved 9.6 cm up a celery stalk in 4 hours. Calculate the mean rate of movement in cm per hour.
(2)cm per hourTotal for this question: 2 marks
3.4 Xylem
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Explain why mineral ions such as nitrate need to reach the leaves.
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Total for this question: 2 marks
3.4 Xylem
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Illustrative context: Dutch elm disease blocks the xylem of elm trees.
Explain why a plant wilts if its xylem is blocked by a fungus.
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Total for this question: 2 marks
3.4 Xylem
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State two functions of xylem.
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Total for this question: 2 marks
3.4 Xylem
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In a cross-section of a young root, where is the xylem found?
(1)Total for this question: 1 mark
3.4 Xylem
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Distance moved by dye in celery stalks Condition Distance after 3 hours / cm still air, 20 °C 4.5 moving air (fan), 20 °C 8.1 still air, 30 °C 6.9 Illustrative data, not from a real investigation. Explain why the dye travelled furthest when a fan was used.
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Total for this question: 2 marks
3.4 Xylem
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Distance moved by dye in celery stalks Condition Distance after 3 hours / cm still air, 20 °C 4.5 moving air (fan), 20 °C 8.1 still air, 30 °C 6.9 Illustrative data, not from a real investigation. Calculate the percentage increase in distance when the fan was used compared with still air at 20 °C.
(2)%Total for this question: 2 marks
3.4 Xylem
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Distance moved by dye in celery stalks Condition Distance after 3 hours / cm still air, 20 °C 4.5 moving air (fan), 20 °C 8.1 still air, 30 °C 6.9 Illustrative data, not from a real investigation. Suggest two variables that should have been controlled in this celery investigation.
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Total for this question: 2 marks