Plant Hormones and Responses

Flashcards about Plant Responses to Internal and External Signals

__ pathways link signal reception to response.

Signal Transduction

In signal transduction, __ transfer and amplify signals.

second messengers

Plant cell-to-cell communication occurs through __.

chemicals

__ are organic molecules used for systemic coordination in plants.

Hormones

Name four major types of plant hormones: Auxins, Gibberellins, Cytokinins, __.

Abscisic acid

__ is a plant's response to light.

Phototropism

Phototropism occurs only when the __ is illuminated.

tip

__ produced in response to light exposure accumulates on the shaded side of the plant.

Auxin

__ promotes cell elongation on the dark side of a plant stem, causing it to bend toward the light.

Auxin

__ is any chemical that promotes elongation & growth in plants.

Auxin

Indoleacetic acid (IAA) is the most common type of __.

Auxin

Auxin transporters move auxin from the basal end of one cell into the __ end of the neighboring cell.

apical

__ increases activity of proton pumps in cell elongation.

Auxin

__ stimulate the growth of lower branches.

Reduced flow from shoot

__ is a common weed killer.

2,4-D

__ promotes cell division and differentiation in plants.

Cytokinins

__ delays aging (senescence) in plants.

Cytokinins

Removing the apical bud __ auxin, freeing cytokinins from control.

decreases

__ interact in the suppression of lateral buds.

Cytokinins, auxin, and others

__ is important for seed germination, stem elongation, fruit growth and ripening.

Gibberellins

In many plants, both and must be present for fruit to set.

auxin, gibberellins

The release of __ from the embryo signals seeds to germinate.

gibberellins

Gibberellins (GA) send a signal to the __ during germination.

aleurone