Classification and naming

Any classification system involves the grouping of organisms or objects using characteristics common to members within the group.The organisms constituting the plant kingdom are distinguishable from animals in having sedentary growth, cellulose cell walls and polyploidy (see Chapter 8). They are able to change energy from one form, light, into another, organic molecules (autotrophic nutrition; see Photosynthesis, page 53). Animals, amongst other things, have no cell walls and rely on eating readymade organic molecules (heterotrophic nutrition).