In the plant


This chapter includes the following topics:

  • Water movement in the plant
  • Diffusion and osmosis
  • Xylem and phloem
  • Transpiration and water loss
  • Effectofevaporation,temperatureand humidity
  • Stomata
  • Mineralsintheplant with additional information on:
  • Sugar movement in plants
Figure 9.1 Apple (Cox on M1) excavated at 16 years to reveal distribution of roots. Note the vigorous main root system near the surface with some penetrating deeply (courtesy of Dr E.G. Coker)


Water is the major constituent of any living organism and the maintenance of a plant with optimum water content is a very important part of plant growth and development (see Soil Water, Chapter 19). Probably more plants die from lack of water than from any other cause. Minerals are also raw materials essential to growth (see p126), and are supplied through the root system.

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