a) Thigmotropism/haptotropism
b) The part of the stem in contact with the tree trunk has lower auxin content than the outer part;
High concentration of auxin on the outer part away from the plant promotes faster growth of this side causing the stem of the plant to grow or coil round the tree trunk.
sharon kalunda answered the question on March 22, 2019 at 11:13
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Type ......................................................
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