Biology: Plant Organs, Tissues, and Cells: Part One
Plant Organs, Tissues, and Cells
Multicellular organisms are composed of specialized types of cells that make up tissues, organs, and organ systems. In the human body, for example, our cardiovascular system is composed of specialized muscle, connective, and nerve cells. These cells form the heart, arteries, and capillaries of that organ system. Plants, as mentioned previously, are much simpler. A plant has two organ systems: the shoot system and the root system. The shoot system is above ground and is composed of organs such as leaves, buds, stems, flowers (if the plant has any), and fruits (if the plant has any). The root system includes the belowground parts of the plant, such as the roots, tubers, and rhizomes. Photosynthesis occurs within the shoot system, either in the stem or in modifications of the stem that we know as leaves. Reproduction also occurs in the shoot system, either in specialized spore-producing structures known as sporangia or in parts of the flower. The root system anchors the plant into the soil. It also stores excess sugar, absorbs water and mineral nutrients from the soil, and acts in vegetative propagation of the plant.
Labeled diagram of a whole bean seedling.
Now go on to the next part. 
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