. A companion to Blackie's tropical readers, books I and II : containing suggestions for experiemnts and practical work . » Fig. 10. â Longitu-dinal Section throughthe Apex of a Root a, Axis ; r, cortex;gp, growing-point; cc,root-cap. 32 COMPANION TO TROPICAL READERS paper to show the exact position of the marks put onthe root. In three or four days compare the root with the copy, and observe thatthe marks are farthest aparttowards the end of the root. Inrecording this experiment makedrawings. Expt. 10. Development of Rootsfrom Radicle of Bean Seed.âGrow a number of bean seedlings,germinating
. A companion to Blackie's tropical readers, books I and II : containing suggestions for experiemnts and practical work . » Fig. 10. â Longitu-dinal Section throughthe Apex of a Root a, Axis ; r, cortex;gp, growing-point; cc,root-cap. 32 COMPANION TO TROPICAL READERS paper to show the exact position of the marks put onthe root. In three or four days compare the root with the copy, and observe thatthe marks are farthest aparttowards the end of the root. Inrecording this experiment makedrawings. Expt. 10. Development of Rootsfrom Radicle of Bean Seed.âGrow a number of bean seedlings,germinating the seeds on dampblotting paper, in moist sawdust,and in the soil itself. Make sixdrawings from observations, show-ing the radicle from the time itwas dormant until it had de-veloped into a root system twomonths old. Expt. 11. Development of Rootsfrom Radicle of Corn Seed.âFig. li.âExperiment to Repeat Experiment 10, examin- detennine the Growing ., .-. e Point of a Root mg the growth of roots in corn seedlings instead. Observe thatthe radicle dies back after a time, and numerous fibrousroots take its ROOTSâII (See Tropical Readers, Book I, pp. 75-78.) Expt. 12. Storage of Food in Roots.âKeep carrotsand turnips growing until they produce flowers andseeds; observe that the fleshy roots get much smaller. Expt. 13. Aerial or Adventitious Roots.âMakedrawings of the aerial or adventitious roots, which EXPERIMENTS AND PRACTICAL WORK 33 grow partly or entirely above ground, on six plants, screw pine, mangrove, orchid, sugar cane. Expt. 14. Necessity for Roots.âCut the roots off aweed; plant it in the soil; support it by a stake. Notewhether it grows or not. Expt. 15. Root-hairs.âGrow some radish seedlingson a piece of flannel and observe the tiny root-hairs. Expt. 16. Tuberous Roots and Tubers.âExaminethe tuberous root of the cassava and compare it withthe tuber of a yam; put both aside in a moist place,and observe that the latter readily develops shootsfrom its
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