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| green coloring of leaves and plants needed for photosynthesis |
| organisms having pairs of homologous chromosomes |
| primary root
The first root of a plant, originating in the embryo. In gymnosperms, eudicotyledons, and magnoliids, the primary root develops into the taproot. In monocotyledons, the primary root disintegrates as the lateral roots develop into a system of fibrous roots. |