. A text-book of botany for secondary schools. Botany. GERMINATION OP SEEDS 95. Fig. 89a.—First stage of the series shown in Fig. 89; one cotyledon removed to show the relation of parts, and the arch developed by the first internode. phototropism. It is interesting to note that a tap-root be- ing positively geo- tropic, positively hy- drotropic, and nega- tively phototropic, all of its responses under ordinary conditions combine to direct it into the soil. 56. Other seeds.— It must not be sup- versely phototropic. The adjust- ment of the leaf-blades to the new direction of the light may be see
. A text-book of botany for secondary schools. Botany. GERMINATION OP SEEDS 95. Fig. 89a.—First stage of the series shown in Fig. 89; one cotyledon removed to show the relation of parts, and the arch developed by the first internode. phototropism. It is interesting to note that a tap-root be- ing positively geo- tropic, positively hy- drotropic, and nega- tively phototropic, all of its responses under ordinary conditions combine to direct it into the soil. 56. Other seeds.— It must not be sup- versely phototropic. The adjust- ment of the leaf-blades to the new direction of the light may be seen in Fig. 87. The root also is phototropic, turning directly away from the source of light; that is, it is negatively phototropic. Fig. 88 shows a seedling of white mus- tard so arranged that both stem and root are exposed only to weak light, the former showing positive, the latter negative Fig. 90.—Seedling of castor-bean, showing large and green Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Coulter, John Merle, 1851-1928. New York, D. Appleton
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectbotany, bookyear1906
