本题目来源于试卷: Form and Function B.6 Gas Exchange，类别为 IB生物学
[问答题]
Plants transport water from the rootnr(4 y xt)wfo 8nyfz04s to the leaves to repla+vxtzd y( dq)5r+p+xr ce water lost by evaporadt +pzv)r+yxd5(qr+xtion.
1.Outline the structural changes in the xylem vessels as they mature from primary to secondary xylem.
2.Describe the movement of water in plants beginning with water in the soil and ending with water vapour in the atmosphere.
3.Explain how different environmental factors affect the rate of transpiration.
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