Plants are eukaryotic, autotrophic organism with differentiation into stem, root and leaf. The branch of science that deals with the study of plants is called botany.
Yeast (Saccharomyces cerevisiae) is a fungus belongs to the phylum Ascomycota.  Yeast is an unicellular eukaryotic, heterotrophic organism without differentiated plant body. It is a widely studied model organism for understanding the eukaryotic cell structure and function.
Difference between Plant cell and Yeast cell

Plant cell
Yeast cell
Generally multicellular eukaryotic organism
Yeast is unicellular eukaryotic organism
Cell wall is made up of cellulose
Cell wall is primarily made up  of polysaccharides glucans and mannan and small amount of chitin
Plant cell possess chloroplast therefore carrying out photosynthesis (autotrophs)
Chloroplast is absent in yeast cells therefore mostly living as saprophytes (feeding on dead decayed matter) or as parasites (heterotrophs)
In plant cells, phytosterols are associated with plasma membrane and membranes of other organelles
In yeast cells, ergosterol is the most common sterol associated with plasma membrane and membranes of other organelles
In plant cell, starch granules are present as stored food is starch
In yeast cells, glycogen granules are present as stored food is glycogen
Individual cells generally reproduce by mitosis as each cell is a part of multicellular organism
Yeast reproduce by binary fission or budding


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