CONTENTS 



PROBLEM 



60. What do plants take out of the soil ? 



61. How are root hairs able to take mineral matter out of the soil ? 



62. What are root tubercles and what is their use ? . 



63. What is crop rotation and what is its use ? . 



64. What roots are useful as food ? . . 



PAGE 



78 

 79 

 79 

 80 

 80 



84 



85 

 85 

 85 

 86 



VII. Plant Growth and Nuteition — Plants Make Food 



65. To prove that water is given off by a green plant 



66. Through which surface of a leaf does transpiration take place ? 



67. To determine how the structure of a leaf fits it for the work it has to do 



68. To study the microscopic structure of a leaf 



69. To show the effect of light on green leaves 



70. To determine the relation of light to the presence of starch in a green 



leaf 87 



71. Is a part of the air a factor in starch making in leaves ? . . .87 



72. The need of chlorophyll for starch making 



73. To consider the leaf as a manufactory ... . . 



74. To show that a gas is given off as a waste product when green plants 



make starch .... ... 88 



VIII. Plant Growth and Nutrition — The Circulation and 



Final Uses of Food by Plants .... 91 



75. Groups of plants told by the structure of their stems . . 91 



76. To study the structure of a woody stem ... . 92 



77. To prove that liquids rise through stems (Review) . . . . 98 



78. To find out through which part of a woody stem food passes down . 94 



79. How plants with special digestive organs get their nitrogenous food . 94 



IX. Our Forests, their Uses and the Necessity for thuik 



Protection ...... 96 



80. To determine how lumber is cut and how to recognize the cut in trim 96 



81. To determine some uses of stems .97 



82. To determine the value of certain woods . . . 97 



83. Museum trip for study of woods . . . . . . 98 



84. To identify common trees by the use of a key . . . 99 



X. The Economic Relation of Green Plants to Man . 106 



85. To determine the economic importance of some green plants . . 106 



86. To learn to know some green plants harmful to man . . . 107 



XI. Plants without Chlorophyll in their Relation to Man 110 



87. To determine the relation of fungi to the destruction of certain trees 111 



88. To determine the conditions favorable for the growth of mold . 112 



89. To study the structure of bread mold 112 



