. Plant anatomy from the standpoint of the development and functions of the tissues, and handbook of micro-technic. FIG. 75.—Diagram to show the effect of different portions of the spectrum on photo-synthesis, o, to F, different regions of the spectrum from red to blue. A filamentous algalies across these, and bacteria are collecting about the alga, with greatest frequency in thered between B and C, indicating the greatest evolution of oxygen there. (After Pfeffer.) The steps in the chemical process of food-construction can-not be followed, but it is interesting to note how simple theprocess m
. Plant anatomy from the standpoint of the development and functions of the tissues, and handbook of micro-technic. FIG. 75.—Diagram to show the effect of different portions of the spectrum on photo-synthesis, o, to F, different regions of the spectrum from red to blue. A filamentous algalies across these, and bacteria are collecting about the alga, with greatest frequency in thered between B and C, indicating the greatest evolution of oxygen there. (After Pfeffer.) The steps in the chemical process of food-construction can-not be followed, but it is interesting to note how simple theprocess might be, as, for example, 6CO2 + 6H2O = C6H12O6(glucose)+ EpidermisFIG. 76.—Diagram to show the three general tissue regions of a leaf. Relation of Leaf as a Whole to Photosynthesis.—A leaffrom the standpoint of its cellular anatomy consists of threedistinct parts: the epidermis, the ground or fundamental paren-chyma, and the vascular bundles (Fig. 76). The epidermis RELATION OF LEAF TO PHOTOSYNTHESIS has a waterproofed outer wall after the manner of a typicalepidermis (see page 28), and it is perforated on one or bothsurfaces of the leaf with stomata to allow the entrance of carbondioxide as described in Chapter VIII. The ground parenchyma,also called the mesophyll, is differentiated into three kinds oftissues: the palisade parenchyma, occupying the upper half;the spongy parenchyma, of the lower half; and the border par en-
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