الفهرس 
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Abstract
Living organisms, whether they are plants, animals or microbes, are made up basically of the same chemical com- ponents. It is important to study the way in which these components are synthesized and utilized by the organisms in the life processes. The unity of life, the common ancestry of living things, and the similarity in chemical make-up, suggest that very similar chemical processes are carried out in all organisms. Comparative biochemistry has shown that while this is true in essence it is untrue in detail; there is a basic pattern of chemical processes common to all ganisms but major or minor modifications have been evolved by different organisms to suit their particular require- ments.
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In considering the biochemistry of plants, therefore, it is necessary to deal not only with processes which are unique to plants but also with processes which are carried out, with only minor differences, by other living organisms.
In all green plants (autotrophic organisms), their nutrients are CO2, H2O, NO3, SO2 and PO, plus trace amounts of other elements. These simple materials supply six of the major elements, carbon, hydrogen, oxygen, nitrogen, sul- phur and phosphorus which make up the bulk of the tissue.