The chemical most often used commercially for rooting cuttings is which?

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Multiple Choice

The chemical most often used commercially for rooting cuttings is which?

Explanation:
Root initiation in cuttings is driven by auxin hormones, and indolebutyric acid is the most common choice commercially because it is a stable, effective synthetic auxin that reliably stimulates adventitious root formation across many plant species. Its stability in storage and in solution means it works well in commercial rooting products, unlike the natural auxin (IAA), which degrades quickly under light and in plant tissue. Naphthaleneacetic acid is another auxin used in some products, but indolebutyric acid is the default due to broader effectiveness and practical handling. Indolepropionic acid isn’t used as a rooting hormone.

Root initiation in cuttings is driven by auxin hormones, and indolebutyric acid is the most common choice commercially because it is a stable, effective synthetic auxin that reliably stimulates adventitious root formation across many plant species. Its stability in storage and in solution means it works well in commercial rooting products, unlike the natural auxin (IAA), which degrades quickly under light and in plant tissue. Naphthaleneacetic acid is another auxin used in some products, but indolebutyric acid is the default due to broader effectiveness and practical handling. Indolepropionic acid isn’t used as a rooting hormone.

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