Explain water transport and support in xylem
Connect the water pathway with the minerals it carries and the support it provides.
Exam scope and assessment notes
Core and Extended · Biology 0970, 2026–2028. Use the stated specimen features and evidence. Diagrams are schematic. Written practice is self-checked; human subject-teacher review, supervised practical competence and cumulative assessment remain pending. Cambridge states that IGCSE 0970 has the same subject content as IGCSE 0610, with 9–1 grading. This StudyForA pathway maps the 2026–2028 syllabus only. This 9–1 graded qualification is available only in a limited number of administrative zones. Confirm that your centre can enter you for this code and exam series with Cambridge International. Cambridge has published a separate syllabus for 2029. StudyForA has not reconciled that version yet; this page supports exams in 2026, 2027 and 2028 only.
Before you begin
- Recall mineral-ion roles in plant nutrition.
Work on paper. Try each question before revealing help, and explain why your method works.
Quick readiness check
Which material supplies magnesium to a root?
What you will learn
- Name the materials carried in xylem
- Separate transport from support
A pathway through the plant
Xylem transports water and dissolved mineral ions from roots towards stems and leaves. Water arriving in a leaf supplies its cells and replaces water lost during transpiration. Mineral ions are dissolved substances, not tiny pieces of soil travelling through a stem.
Nitrate ions support amino-acid production and magnesium ions support chlorophyll production. A transport route tells us how ions reach a leaf; it does not mean that every transported ion has the same function.
Support has a separate explanation
Xylem also helps support the plant. Its strengthened walls resist deformation and contribute to holding stems and veins in shape. Supporting a structure and carrying a solution are two functions of the same tissue.
Sucrose is normally transported in phloem, not assigned to xylem merely because it dissolves in water. Identify the substance and tissue together. Root-to-leaf arrows in this model show the usual transpiration stream; they are not a full map of every possible water movement.
Pause and explain
Which statement gives two xylem functions?
Worked example
Water containing magnesium ions reaches a leaf. Name the tissue and two relevant functions.
Show the worked solution
- The transported materials are water and dissolved mineral ions, so identify xylem.
- State movement of that solution, then give support as a separate tissue function.
Answer Xylem carries water and mineral ions and helps support the plant. Magnesium is used in chlorophyll production.
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Write your answer and reasoning first. Use a hint only if you are stuck. The model solution is for self-checking; your written work is not automatically marked.
Classify water, nitrate ions and sucrose by their usual long-distance transport tissue.
Give me a hint
Separate the solution arriving from roots from the organic nutrient.
Compare my reasoning
- Water and nitrate ions travel in xylem.
- Sucrose is an organic nutrient transported in phloem.
Water and nitrate ions: xylem. Sucrose: phloem.
Look for these in your work
- Correctly assign both xylem materials
- Assign sucrose to phloem
A student writes “xylem only transports water”. Improve the sentence with two missing details.
Give me a hint
One detail is carried; the other is structural.
Compare my reasoning
- Add dissolved mineral ions to the water statement.
- Add support as a distinct function.
Xylem transports water and dissolved mineral ions and also supports the plant.
Look for these in your work
- Include mineral ions
- State support separately
A stem bends after its supporting tissues are damaged. Does this observation alone prove that its water transport has stopped? Explain.
Give me a hint
Consider what the observation measures.
Compare my reasoning
- Bending is evidence about mechanical support.
- Water transport requires separate observations or measurements.
No. The damaged support can explain bending, but the observation alone does not establish zero water transport.
Look for these in your work
- Use the support evidence
- Avoid an unsupported transport conclusion
Common mistakes
- Describing xylem as a sugar-transport tissue.
- Calling support a substance that flows through the vessel.
What can you explain now?
Which statement gives two xylem functions?
Compare with the explanation
Water/mineral-ion transport and support
These are distinct functions of xylem.
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Make it stick
Without notes, name two transported materials and one structural function of xylem.
If you needed the solution, close it and solve the problem again from a blank page. A correct answer is stronger when you can explain the reason for each step.