Potatoes and celery help maintain plant structure due to their specialized tissues. Potatoes, as tubers, store energy and provide stability through their dense, sturdy structure, while celery has a rigid, fibrous stalk that contains collenchyma and sclerenchyma cells, offering support. Together, these adaptations help the plant remain upright and resist bending or breaking under various environmental conditions.
the stem
A meat used to hold a plant upright is a "steak." This term can refer to either a cut of meat or a wooden or metal rod used for support in gardening.
The homophones you're looking for are "stake" and "steak." A "stake" is used to hold a plant upright in the ground, while "steak" refers to a cut of meat. These two words sound the same but have different meanings and spellings.
A plant cells consists of a cell wall (it hold the plant upright) and contains chlorophyll to feed itself.
They don't hold you upright, more like sideways...
Roots
A stem or stalk typically holds up the flower in most plants. This part of the plant provides support for the flower to remain upright and accessible for pollination. Some plants may also have specialized structures such as bracts or peduncles to hold up the flower.
Those are called the "eyes" of the potato and sprout when the potato isn't as fresh any longer; these are called seed potatoes. You can actually plant the potato "eyes" (or the whole potato) and they will grow more potatoes, but you have to do it at the right planting time for where you live. You can also sprout them in a glass of water indoors and they will grow long vines, much like a house plant. To do this, insert toothpicks around the center of the potato so they will hold the top half out of the water, otherwise the whole potato will rot.
Turgid walls help hold the plant upright by internal water pressure. A adaption that allowed plants to acquire the land as a niche.
Plant stems hold the plant upright an carry nutrients from one part of the plant to the other.
To act as a conduit for sap and to hold the flowers upright.
... is to hold testtubes in upright position.