Laboratory Manual of a Year in Science

Cover Laboratory Manual of a Year in Science
Laboratory Manual of a Year in Science
Joseph Luther Thalman
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The corn stalk is an example of the monocoty- ledenous type, and the box elder of the dicotyledenous type.
Exercise 60. Functions of Stems.
Object : To determine one of the functions of stems.
Apparatus Impatiens stem Beaker Eosin solution Scalpel Potato Directions: Cut off a number of branches of the Impatiens, of the Coleus, or of any other plant with a thin epidermis, and immediately place the cut end in a beaker of eosin solution. Similarly, cut off the end of a potato and place the cut end
... in the eosin solution. Set them aside for several hours. Then examine the stems to determine the paths taken by the red solu- tion. To see this more clearly, make a longitudinal section of the stem. What part of the stem is stained, the pith, wood, or epidermis? Does this stain extend into the leaves ? What is its course through the leaves ?
90 LABOKATOEY MANUAL Break off a leaf from the stem. Examine the end of the leaf stalk. What do the red dots on the end indi- cate ? Through Avhat part of the stem do liquids pass ?


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