Final answer:
Collenchyma is the non-adult tissue in plants, unlike the other options listed.
Explanation:
Collenchyma is the tissue that is not categorized as an adult tissue.
In plants, parenchyma, collenchyma, and sclerenchyma are types of simple tissues, while xylem and phloem are complex tissues.
For example, in the stem of a flax plant, the cortex and pith layers are made of parenchyma cells.
Learn more about Plant Tissues here:
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