_______ cells perform their primary function when they are dead.

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Sclerenchyma cells are usually dead when they perform their primary function of providing mechanical support and protection to the plant. These cells have thick, lignified cell walls that make them rigid and durable, but also prevent them from growing and dividing. In contrast, parenchyma and collenchyma cells are alive and metabolically active, carrying out functions such as photosynthesis, storage, and transport. Companion cells are specialized parenchyma cells that support and regulate the activity of sieve tube elements in the phloem. Tracheids are elongated cells that function in water transport in xylem tissue.

_______ Cells Perform Their Primary Function When They Are Dead