4 PHARMACEUTICAL BOTANY 



According to the position of the cells in which plastids occur and 

 the work they perform, they differ in color, viz. : 



Leucoplasts are colorless plastids found in the underground portions 

 of a plant and also in seeds, and the egg cell. Their function is to build 

 up reserve starch from sugar and other carbohydrates as well as to 

 change the reserve starch back into sugar when it is needed for the 

 growth of the plant. 



Chloroplasts are plastids found in cells exposed to light and contain 

 the green pigment, chlorophyll. 



Chromoplasts are plastids found in cells independent of their rela- 

 tion to light or darkness and contain the yellow or orange pigment 

 called chromophyll. 



During cell division another protoplasmic body appears called a 

 centrosome. 



NON-PROTOPLASMIC CeLL CONTENTS 



, \ Assimilation. 



1. Starch i _, 



[ Reserve. 



2. Inulin. 



3. Sugars such as dextrose, levulose, saccharose, maltose, 

 gentianose, mannitol. 



4. Cell-sap colors (in solution of cell sap). 



5. Alkaloids. 



6. Glucosides. 



7 Neutral Principles. 

 8. Feebly basic substances. 

 Aleurone grains. 



Rosette aggregates. 



monoclinic prisms. 



Crystal fibres. 



r aphides. 



Micro-crystals. 



10. Calcium Oxalate 



11. Cystoliths. 



12. Tannin. 



13. Gums and Mucilage. 



14. Oils. 



15. Resins. 



f Proteolytic. 



16. Enzymes \ Diastases. 



1 Invertases. 



