BOTANY

Detailed explanation-1: -80 out of 100 seeds to germinate. Jennifer is using “Rootone” on her poinsettia cuttings. She knows that an advantage of using hormones on cuttings is that they: Speed root development.

Detailed explanation-2: -Auxins control many different aspects of growth and development, as is typical of plant hormones. For instance, they are known to influence the elongation of stems and leaves, the setting and ripening of fruits, and the growth in thickness of trees. They also stimulate the formation of new root tips in stem cuttings.

Detailed explanation-3: -Auxins stimulate root formation on the stem cuttings, e.g., IBA, IBA-alanine, NAA. NAA is synthetic auxin while IBA is considered as both natural and synthetic.

Detailed explanation-4: -In horticulture, auxins, especially NAA and IBA, are commonly applied to stimulate root initiation when rooting cuttings of plants. However, high concentrations of auxin inhibit root elongation and instead enhance adventitious root formation.

Detailed explanation-5: -Auxin is a plant hormone that aids in the initiation of adventitious roots. Indole acetic acid (IAA) is the naturally occurring auxin found in plants. IAA is involved in nearly every aspect of plant growth and development.