13 



25. Histology of Stem. Draw the prepared longitudinal section under the high 

 power, showing: epidermis; collenchyma; cortex; endodermis; pericycle fibres; phloem 

 with sieve-tubes and parenchyma; cambium; pitted and spiral vessels of xylem; pith. 



26. Growing Point of Stem. Draw the prepared longitudinal section under both 

 powers, showing : dermatogen ; periblem ; plerome ; origin of vascular bundles from 

 plerome ; young leaves ; origin of branches. 



