Translocation involves movement of substances in plants - OCR Gateway - GCSE Biology Combined Science - Question 14 - 2019 - Paper 1
Question 14
Translocation involves movement of substances in plants. A scientist investigates translocation in a tree.
She cuts a ring of bark away from the stem of a tree. The... show full transcript
Worked Solution & Example Answer:Translocation involves movement of substances in plants - OCR Gateway - GCSE Biology Combined Science - Question 14 - 2019 - Paper 1
Step 1
i) Which transport vessels have been removed along with the ring of bark?
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Answer
The transport vessels that have been removed along with the ring of bark are the phloem vessels. The phloem is responsible for the translocation of nutrients and sugars in the plant.
Step 2
ii) Which transport vessels remain in the wood?
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Answer
The transport vessels that remain in the wood are the xylem vessels. The xylem is responsible for the transport of water and minerals from the roots to the rest of the plant.
Step 3
b) Write down one substance that is translocated.
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One substance that is translocated is glucose.
Step 4
ii) What conclusion can be made about the direction of movement in the vessels that have been removed in the ring of bark? Explain your answer using evidence from the diagram.
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The conclusion that can be made is that the movement of substances in the phloem vessels is generally downward from the leaves towards the roots. This is evidenced by the swelling in the area above the cut, indicating that sugars are accumulating there, as they are no longer able to move downward past the ring where the phloem has been removed.
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