well i'm sort of going to disagree with martyn, he is right, but some tasks are less design specific than others...
the woodlore standard makes a great wood carving knife, try slicing a swede (turnip like vegetable) not one of our northern cousins, and you won't like it. but it makes a good potatoe peeler. the scandanavian or zero bevel edge is a bit less robust than some.
the woodlore standard will do just about any other knife task no problem. though some folks will suggest that it makes a poor fillet knife.
a big thick combat/survival knife with a large steep secondary bevel will be pants at: peeling potatoes, carving wood, slicing swedes (turnip like vegetable) not one of our northern cousins, and sharpening pencils. it will cut string and helicopters quite adequately. (being a bit facetious)
a really thin knife with a slight shallow secondary bevel will do most of the above tasks quite happily. but it may suffer some serious damage if you try to baton it through a knotty lump of wood.
all in all the idea of carrying more than one knife is a very sound one. you might choose a woodlore/woodlore clone and a large (long blade) swiss army knife, or an opinel. you might decide that with a hatchet, a frosts clipper is a perfectly adequate tool. the choices are limitless.
however, if you do find "the one knife" let us know 'cause i want one!
cheers, and.