Fortunately, we have 3D models to show you how the vascular tissues are arranged differently in monocot and dicot stems! Vascular plants have two types of tube-shaped vascular structures—phloem and xylem—arranged in bundles. Negative pressure pushes water and dissolved minerals up through the xylem, bringing the materials needed for photosynthesis to the stem and leaves.
Dissolved sugars and organic compounds essentially, the products of photosynthesis move through the phloem to parts of the plant where they can be stored for later use. Screenshot of the monocot stem 3D model in Visible Biology beta with the vascular bundles highlighted. In dicot stems, the vascular bundles are arranged in a ring around the pith—the central part of the stem, which is composed of ground tissue. In the following image, you can see another type of tissue—called vascular cambium—in the vascular bundles, alongside the phloem and xylem.
The vascular cambium is present in dicot, but not monocot, stems. Vascular cambium helps facilitate secondary growth and widens the girth of the stem over time. Screenshot of the dicot stem 3D model in Visible Biology beta. And there you have it—five questions to help you figure out whether a plant is a monocot or a dicot. For more 3D models and info about the structure of monocot and dicot roots, stems, and leaves, check out the Biology Learn Site! Be sure to subscribe to the Visible Body Blog for more anatomy awesomeness!
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