MTTC Missed Topics Practice Test

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Pith tissue located in the center of the stem serves what function?

Found in center of the stem; storage and internal support

Layer surrounding vascular tissue in roots; controls what enters xylem

Pith tissue located in the center of the stem; storage and internal support

The central tissue in stems, called the pith, is made up mainly of parenchyma cells that store nutrients and water and help keep the stem's shape by providing internal support through turgor. This combination of storage and support is exactly what the pith does, which is why this description fits best for a tissue located at the stem’s center. Other options point to different structures or non-plant ideas—the layer around vascular tissue in roots (endodermis) regulates entry into the xylem, and “wispy clouds” isn’t a tissue at all.

Wispy clouds