Exam 30: Communication Strategies in Plants

Gravity-sensing mechanisms of many organisms are based on

-Rhythms that are repeated every 24 hours are

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 -ethylene

__________ lengthen stems, break dormancy in seeds and buds, and stimulate flowering.

-The effect of directional growth shown in the above figure is known to be caused by

__________ is a response to changes in length of night relative to length of day.

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 -short-day plant

The gaseous plant hormone is

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 -long-day 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 -salicylic acid

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 -annual

Even though the autumn may be unusually warm, the leaves from deciduous trees begin to drop during September.Which of the following is the best explanation?

-Photoperiodism is the

The primary root of a seedling grows down

Plants cannot ____ in the dark.

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 -target cell

Short-day plants

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 -Pfr

Synthetic auxins are used as

__________ promotes senescence and abscission.It also inhibits growth of roots and stems.