116 BOTANY: PRINCIPLES AND PROBLEMS 



50. Why does a gardener use "brush " to support peas but poles to support 

 beans? 



51. Do all buds have scales? 



52. Give an example of buds which do not arise at a node. 



63. Why do apple and elm trunks make better chopping blocks than do 

 most woods ? 



54. What is the essential feature in the manufacture of wood-pulp ? 



55. Why is paper that is made from wood-pulp so much less tough than 

 that made from cotton or linen? 



56. What is the difference between a wood which is ring-porous and one 

 which is diffusely-porousf 



57. Wliat is the process of veneering wood, and what are its advantages 

 and disadvantages? 



58. What is "quartered" oak and why is it more expensive than ordinary 

 oak? 



59. Wliy can oak be quartered to advantage although most woods cannot 

 be? 



60. Why cannot the ascent of water in the stem of a plant be explained on 

 the principle of a suction pump? 



61. Give the derivation of the following terms and explain in what way 

 each is appropriate: 



Node Cortex Lenticel 



Xylem Tracheid Phyllotaxy 



Phloem Cambium Fibro-vascular 



