|'a<;k 

 78 

 7H 

 79 

 80 

 80 



84 



85 

 85 



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 ? 



VII. Plant Growth and Nutrition — 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 hius to do 86 



68. To study the microscopic structure of a leaf ..... 80 



69. To show the effect of light on green leaves .80 



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 88 



73. To consider the leaf as a manufactory 88 



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



make starch 88 



VIII. Plant Growth and Nutrition — The CiRrri. \ti<>n wi. 



Final Uses of F'ood by Plants .... HI 



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



76. To study the structure of a woody stem 



77. To prove that liquids rise through steins (Review) 



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



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



91 



93 

 •>4 

 'M 



IX. Our Forests, their Uses and the Necessity kok thkir 



Protection ...... 9<J 



80. To determine how lumber is cut and how to reco-nj/x tho rut in trim 1>0 



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 M*n . KX) 



85. To determine the economic importance of sonu' green plants . . 1(M» 



86. To learn to know some green plants harmful to man .... 1«>7 



XI. Plants avithoft Cmlorophvii. in their 1?i:i.atio\ to Mvn 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 



