[9] 87 FLOWERING PLANTS 



Herbaceous Stems (continued). 



D. Examine in water, a transverse section of the stem of the Sunflower and draw a diagram indicating the 

 following tissues and system of tissues ; epidermis, outer cortex, inner cortex, endodermis (starch sheath) and 

 central cylinder (stele) consisting of (i) pericycle (fibrous opposite bundles, parenchymatous between), rays, pith, 

 and (ii) vascular bundles, shewing xylem, phloem and cambium. 



Add a drop of Schulze's solution, and observe that the cell-walls of most of the tissues turn blue (cellulose) 

 while those of the pericycle fibres and most of the xylem turn yellow (lignified). 



