You are examining a rigid plant tissue; it does not flex or bend. Tests show that it is not consuming oxygen gas, as would be expected if aerobic respiration were occurring. This tissue is probably

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Sclerenchyma is known for its rigidity and strength, which is due to the thick secondary walls that are often impregnated with lignin. This characteristic makes it less likely to be involved in processes that require a lot of energy, such as aerobic respiration, compared to other types of plant tissue that are more involved in growth, transport, or photosynthesis.

You Are Examining a Rigid Plant Tissue; It Does Not