Question

The most common cytokinin is ______.

Options

• IAA

• Kinetin

• Isopentenyl adenine

• Dihydrozeatin

Answer 1

The most common cytokinin is isopentenyl adenine.

Explanation:

While zeatin is widely recognised as the absolute most common naturally occurring cytokinin in plants, it is not included in the provided choices. Among the given options, isopentenyl adenine (iP) is the correct answer because it serves as a widespread, fundamental, and highly active natural isoprenoid cytokinin. In contrast, IAA is an auxin rather than a cytokinin, kinetin is primarily a synthetic or artificial aromatic analogue, and dihydrozeatin is less abundant.