Elementary principles of agriculture : a text book for the common schools elementaryprinci02ferg Year: 1913 56. The Primary Use of the Stem is to hold the leaves up where they may be fully exposed to the light. Sun- light furnishes the energy for the food-making work. Of course, when the leaves are more exposed to /^. the light and winds, evaporation is increased. HI Therefore, stemmed plants need more water than |||[[P||[ stemless ones. 57. The Growing Point of the Stem is in the bud at the end. The cells at the growing tip are very small and delicate. The young sections, or inter- nodes,*
Elementary principles of agriculture : a text book for the common schools elementaryprinci02ferg Year: 1913 56. The Primary Use of the Stem is to hold the leaves up where they may be fully exposed to the light. Sun- light furnishes the energy for the food-making work. Of course, when the leaves are more exposed to /^. the light and winds, evaporation is increased. HI Therefore, stemmed plants need more water than |||[[P||[ stemless ones. 57. The Growing Point of the Stem is in the bud at the end. The cells at the growing tip are very small and delicate. The young sections, or inter- nodes,* grow in length, forming the stem. The stem length- ens by the multiplica- tion and growth of the cells. All the cells are much alike at first, but, as the cells lengthen, so does the stem. Many changes take place. Soon there are several kinds of cells and ves- sels, as shown in Fig. 22. Some are elongated, e d / y g hi !. Cross-section of a woody stem. Upper one actual size, a, pith; b, d and e, water ducts; c, woody portion; f, phloem; g, h, and i, outer protective layers. After Goodale. *The use of the words nodes and intemodes is made necessary by the double use of the word 'joint.' (34)
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