Exam 30: Communication Strategies in Plants

__________ secreted by one plant cell alter the activity of a different cell.

Classification.Respond to the following statements in reference to the five plant hormones listed below. a.auxins b.gibberellins c.cytokinins d.abscisic acid e.ethylene -Hormones involved in stem elongation and closely related chemically to certain weed killers like 2,4-D.

Abscisic acid promotes bud and seed __________, and it limits water loss by promoting stomatal closure.

Classification.Respond to the following statements in reference to the five plant hormones listed below. a.auxins b.gibberellins c.cytokinins d.abscisic acid e.ethylene -This hormone is a gas that promotes ripening.

Which of the following is not true of plant hormones?

-Which plant hormone listed below is responsible for the symbiotic relationship shown in the above figure?

-Which is(are) the principal substance(s) that regulate(s) thigmotropism?

Would plant roots exhibit gravitropism in outer space? Why or why not?

The polar transport of auxin in a plant

MATCHING Matching.Choose the one most appropriate answer for each.Some letters may not be used. a.flower each successive year or after several years of vegetative growth b.promotes cell elongation in stems c.has receptor sites for a particular hormonal message d.a hollow, cylindrical organ that protects young leaves growing within it e.blue-green pigment that absorbs light energy f.low-temperature stimulation of flowering g.stimulates stomata closure and might be involved in root geotropism h.stimulates fruit ripening i.reproduces in spring j. produces only roots, stems, and leaves the first growing season and produces flowers the second year k.occurring on a 24-hour cycle l. flowers in autumn m. a nonhormonal plant growth regulator n. lives for only one growing season o.promotes stem elongation in plants p. pigment involved in flowering process -circadian

Classification.Respond to the following statements in reference to the five plant hormones listed below. a.auxins b.gibberellins c.cytokinins d.abscisic acid e.ethylene -This hormone promotes bud and seed dormancy.

In some plants, the direction of growth changes in response to contact with an object.This is called __________.

MATCHING Matching.Choose the one most appropriate answer for each.Some letters may not be used. a.flower each successive year or after several years of vegetative growth b.promotes cell elongation in stems c.has receptor sites for a particular hormonal message d.a hollow, cylindrical organ that protects young leaves growing within it e.blue-green pigment that absorbs light energy f.low-temperature stimulation of flowering g.stimulates stomata closure and might be involved in root geotropism h.stimulates fruit ripening i.reproduces in spring j. produces only roots, stems, and leaves the first growing season and produces flowers the second year k.occurring on a 24-hour cycle l. flowers in autumn m. a nonhormonal plant growth regulator n. lives for only one growing season o.promotes stem elongation in plants p. pigment involved in flowering process -auxin

Auxins are secreted by

The requirement of cold weather before a particular plant process occurs (e.g., germination) is known as

MATCHING Matching.Choose the one most appropriate answer for each.Some letters may not be used. a.flower each successive year or after several years of vegetative growth b.promotes cell elongation in stems c.has receptor sites for a particular hormonal message d.a hollow, cylindrical organ that protects young leaves growing within it e.blue-green pigment that absorbs light energy f.low-temperature stimulation of flowering g.stimulates stomata closure and might be involved in root geotropism h.stimulates fruit ripening i.reproduces in spring j. produces only roots, stems, and leaves the first growing season and produces flowers the second year k.occurring on a 24-hour cycle l. flowers in autumn m. a nonhormonal plant growth regulator n. lives for only one growing season o.promotes stem elongation in plants p. pigment involved in flowering process -gibberellin

-Phytochrome is converted from the inactive to the active form by being exposed to light of what color?

Which of the following is found in cocoa?

Abscission and dormancy are triggered by environmental cues such as seasonal changes in __________ or __________.

The plant hormone that promotes fruit ripening is