The present thesis is devoted to investigate the exomorphological and surface scan – of some seeds - attribute by using light and scanning electron microscope, as well as, micromorphological characters and chemical composition of seeds of three different species, each include two varieties or cultivars, representing three genera and three families as follows:-
(From Malvaceae, cotton seed cvs. Giza 86 and Giza 66, Solanaceae, tomato seed vars. Pyriforme and grandifolium and Brassicaceae, rape seed cv. Pactal and var. Tower). The seeds under study even cultivars or varieties were obtained from The Seed Bank Of Flora and Phytotoxonomy Research Department (CAIM), Horticultural Research Institiute (HRI), Agricultural Research Center (ARC). The aim of the present work was to clearity the importance and the significance of the seed morphological attributes and chemical composition to faciliate the process of differentiation and identification of these cultivars and varieties, as well as, using these attributes and chemical composition as critera in taxonomic aspects. The different seed exomorphological, surface scan, anatomical attributes and chemical composition of the studied taxa are presented in forms of cumulative tables and plates, as well as, microphotographic pictures and hand drawings of the cross section of seeds in order to facilitate observation of variations, similarities, correlations and differences among the taxa.