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72. Histology of Stem. Cut a transverse section of the stem and draw it under the 

 low power, showing : epidermis ; parenchymatous ground tissue with thick-walled 

 outer layer ; vascular bundles. Draw a vascular bundle under the high power, showing : 

 sclerenchyma ; phloem with sieve-tubes and companion cells ; xylem with vessels, 

 parenchyma and intercellular passage. 



72 a. Histology of Stem. Cut a longitudinal section of the stem and draw it under 

 the high power showing : epidermis ; ground tissue, consisting of outer thick- walled and 

 inner thin-walled parenchyma ; vascular bundle consisting of xylem with pitted and spiral 

 vessels, phloem with sieve-tubes and sieve-plates and protophloem. 



