Fig. 4.1 shows a photograph of a tree that has been girdled. Girdling means removing a complete ring of bark and phloem all the way round the trunk.
(a(i))[4]
Explain why the region above the girdle in Fig. 4.1 becomes swollen. Include source and sink in your answer.
(a(ii))[2]
Explain why the leaves of girdled trees can still receive mineral ions from the roots.
(b)[3]
Explain why glucose made during photosynthesis is needed for the uptake of mineral ions by the roots.
(c)[2]
State the balanced symbol equation that shows photosynthesis.
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