CONTENTS 



PROBLEM ,, A<JK 



V. PLANT GROWTH AND NUTRITION. CAUSES OF GROWTH . 55 



25. To find the relation of the embryo to the food supply .... 56 



26. To test for starch 57 



27. To test for grape sugar .......... 57 



28. To test for fats and oils . . . . . . . .58 



29. To test for proteins or nitrogenous foods 58 



30. To test for the presence of mineral matter (Optional) ... 59 

 :-Jl. To test for the presence of water 60 



32. To test various food substances for the organic nutrients (Home work) 60 



33. To show how much water is needed to make a seed germinate (Home 



experiment) ........... 61 



34. To determine the temperature best fitted to cause peas to germinate 



(Home experiment) 62 



35. To show that seeds need some part. of the air in order to grow . * . 62 



36. To show that food is needed by the embryo in order to grow . . 63 



37. Is any part of the air necessary for combustion ? (Demonstration) . 63 



38. To test for oxygen (Demonstration) . .64 



39. To test for carbon 65 



40. To test for carbon dioxide . . 65 



41 . To prove that organic substances are oxidized within the human body 66 



42. To prove that growing seeds oxidize food 66 



43. To study the fruit of the corn plant ....... 67 



44. To study the structure of a grain of corn ...... 67 



45. To find the use of the endosperm of the corn grain .... 67 



46. To find whether starch or grape sugar will dissolve in water . . 68 



47. To find how the young plant makes use of the food supply. Digestion 68 



48. What changes take place in starchy foods in the mouth ? (Demon- 



stration) ...... ..... .69 



49. Conditions necessary for the action of diastase 69 



50. What is the reason for digestion of starch in the corn grain ? . . 69 



VI. THE ORGANS OF NUTRITION IN PLANTS THE SOIL AND ITS 



RELATION TO THE ROOTS ..... 72 



51. To find out the structure of roots 72 



52. To determine the influence of gravity on the direction of growth of 



roots 73 



53. To find the effect of water on the growth of roots .... 73 



54. To study the structure and purpose of root hairs .... 74 



55. To discover how fluids travel through roots and stems . . . 74 



66. To find out how root hairs absorb soil water . . . . .75 



67. To determine what kind of substances will pass through a membrane . 76 



58. To test organic material in soil 77 



59. To find what kind of soil holds water best , 77 



