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GROWTH AND DEVELOPMENT IN PLANTS Flashcards

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2449619956control plant movementsHormones0
2449623225targetusually organic cpds, produced by one part of the plant and effect a different part of the plant1
2449628672they are chemical messengershormones2
2449632565auxin, cytokines, gibberellinsGrowth Promoters3
2449637227- most are Indoeacetic acid (IAA) - produced in apical meristem - promotes elongation of young developing shootsauxin4
2449640913- produces phototropisms - migrate down to lateral bud and prevents them from growing - increase in vascular cambiumauxin5
2449640914phototropismsplant grows towards the light6
2449642298_____ ends up on dark side and soften cells - allows them to elongateauxin7
2449646052- produced in seeds -promote development of fruit - can be sprayed to prevent leaf and fruit from droppingauxin8
2449647825- response of stems to gravity - Herbicidesauxin9
2449647826cause plant to grow to deathHerbicides10
2449650942ex. 2-4D (roundup): works best on grasses (monocots) Dioxin - behaves like auxinHerbicides11
2449655550- modified forms of adenine that stimulate cytokinesiscytokines12
2449656724- stimulate RNA and Protein synthesis - move from the roots to target tissue by moving up in the xylem sapcytokines13
2449660295- stimulate axillary bud growth (Auxin can't suppress axillary bud growth once it has begun)cytokines14
2449661610Lower buds thus grow before higher ones since they are closer to the cytokines source than the auxin sourcecytokines15
2449664465- more cytokines than auxincause shoot buds to develop16
2449669440- more auxin than cytokinescause roots to form17
2449674492(70 different kinds)Gibberellins18
2449676745- produce primarily in roots and young leaves - stimulates growth in leaves and stemsGibberellins19
2449678432- stimulates cell elongation and division in stemsGibberellins20
2449680913- cause bolting - controls fruit development along with auxinGibberellins21
2449680914- when released - signals seeds to break dormancy and germinateGibberellins22
2449682379boltingrapid growth of floral parts of a plant23
24496856372 kinds of Growth InhibitorsAbscisic acid (ABA) Ethylene24
2449686747- helps prepare plants for winter by suspending both primary and secondary growthAbscisic acid (ABA)25
2449689641- inhibits cell division in vascular cambium - acts in closing stomata in times of water stressAbscisic acid (ABA)26
2449692829- a gaseous hormone that diffuses through air spaces between plant cellsEthylene27
2449692830- causes fruit to ripen and leaf abscission - released at wound sitesEthylene28
2449696513abscissionleaves fall off29
2449697812growth responses that result in curvatures of the whole plant organs toward or away from a directional stimulusTropisms30
2449700719(Tropisms) Directional:coming from one direction instead of several31
24497033403 Primary Stimuli which result in Tropisms:Phototropism Geotropism Thigmotropism32
2449704725grows toward the sunPhototropism33
2449705713roots grow down, stems/floral parts grow upGeotropism (Gravitropism)34
2449710159(+) geotropismRoots35
2449710160(-) geotropismShoots36
2449712123directional growth in response to touchThigmotropism37
2449714704Nastic movementsTurgor Movements38
2449716050independent of direction of stimulusTurgor Movements39
2449717178reversible movements caused by changes in turgor pressure of specialized cells in response to stimuliTurgor Movements40
2449718320(Turgor Movements) Pulvinireversible movements caused by changes in turgor pressure of specialized cells in response to stimuli41
2449720910(Turgor Movements) Seismonasticmovements due to touch, shaking, thermal stimulation42
2449723335ex. Mimosa, Venus's Fly-trap(Turgor Movements) Seismonastic43
2449725057movement of leaves to a vertical position in evening and lowering of leaves to a horizontal position in morningSleep movements44
2449727215Sleep movements(Turgor Movements)45
2449732064a physiological cycle with a frequency of about 24 hrs that persists even when an organism is sheltered from environmental cuesCircadian Rhythms46
2449733961synchronized with the earth's light dark cycleCircadian Rhythms47
2449734984-physiological response to day length -Critical Night LengthPhotoperiodism48
2449737027controls flowering and other responses to photoperiod-Critical Night Length49

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