KARYOLYMPH 



NUCLEOLUS 



CHROMATIN 



CELL WALL 



MITOCHONDRIA 



NUCLEUS 



CYTOPLASM 



VACUOLE 



NUCLEUS 



CENTRAL 

 VACUOLE 



PRIMORDIAL 

 UTRICLE 



CHLOROPLAST 



CELL WALL 



tviUCLEUS 



CELLULOSE 



MIDDLE 

 LAMELLA- 

 CELLULOSE 



ORIGIN OF 

 CELL PLATE 



MIDDLE 

 LAMELLA 



PRIMARY WALL 





^=--. 



Fig 



TJ ilii; , .. , _^^^'.i;ilM !:Mii,ii]iii:)iMii,;.!ii Liii i I .:.] ■— ?r " .i n' l i . m — ii i ii " ii nnj_m ^ yv AL 



.CYTOPLASM 



PLASMA 

 MEMBRANE 



SECONDARY 

 WALL 



MA 

 BRANE 



CYTOPLASM 



I. — Diagrams to illustrate the structural features of simple plant cells. A, In the young 

 condition, as found near the growing points. No vacuoles are present. B, Somewhat 

 older state with vacuoles developing. C, Mature state, with a single central vacuole and 

 the cvtoplasm confined to the walls. D, Mature cell containing chloroplasts E, Details 

 of the primary- wall structure. F, The development of the various layers of the complete 

 cell wall, frorn the cell plate formed during cell division. (F modified from Sharp.) 



