Monocots / Dicotyledons
seed plants:
- gymnosperms (conifers) this is the seed open to, for example in a journal
- angiosperms ( flowering plants), the seed grows in the ovary of the flower
- monocotyledons (a shoot growing from a seed with one cotyledon)
- dicotyledonous Plant (from a seed a shoot grows with two cotyledons)
seed is only one cotyledon created. The stunted radicle very rapidly and tired of this, it leads to the formation of seitlichangelegten your roots (not the main root). The stem contains vascular bundles. The stems are usually unbranched. Say seedlings with cotyledon and parallel venation leaves. (Such as all grasses, tulips)
Dicots Plant :
If plants whose seeds have two cotyledons and seedlings have network nerv-engine blades.
There are the Einfurchenpollen ( embryo has two cotyledons and pollen grains which is einfurchig) and three furrows pollen (embryo sits between two cotyledons, however, goes from pollen produced with three furrows) infurchenpollen
E 
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Source: http://de.wikipedia.org/
addendum on the basis of comments / questions:
question: work out better, which plants, then, to the 1 - and 2 - keimblättrigen plants belong. What, for example with the beautiful orchids?
Answer:
monocots plants -> lily plants, bulbs, asparagus plants, banana plants, orchids, grasses
Dicots Plants -> Water Lilies similar, magnolias, laurels, pepper, ranunculus, carnations, roses, ... .
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