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34 Cards in this Set
- Front
- Back
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hormones
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chemical messengers that affect a plants ability to respond to its enviornment
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growth regulators
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hormones that inhibit or stimulate growth
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auxins
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hormones involved in plant cell elongation
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indoleacetic acid
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(IAA) an auxin produced in actively growing regions of plants
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naphrhalene acetic acid
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(NAA) a synthetic auxin used to promote root formation on stem and leaf cuttings
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apical dominance
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the inhibition of lateral buds by the presence of a shoot tip
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2,4-D
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a synthetic auxin that is a herbicide or a weed killer
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Agent Orange
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when mixed with 2, 4-D it creates an auxin used to defoliate jungles in the Vietnam War
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Gibberellin
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a plant hormone that among other actions stimulates bolting and cessation of dormancy
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ethylene
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a hormone that is responsible for the ripening of fruits
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ethephon
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a synthetic chemical that breaks down to release ethylene gas
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abscission
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detachment of leaves or flowers or fruits from a plant
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Cytokinins
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promotes cell division in plants
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abscisic acid
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(ABA) helps inhibit other hormones
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growth retardants
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chemicals that prevetn plant growth
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tropism
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a plant movement determined by the direcxtion of an enviornmental stimulus
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phototrpism
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movement in response to light
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solar tracking
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phototropism in leaves or flowers as they follow the suns movement in the sky
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thigmotropism
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plants growth in response to touch
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gravitropism
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a plants growth in response to gravity
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chemotropism
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a plants growth in response to a chemical
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nastic movements
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a type of plant movement that is independant of the direction of the ststimuli
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thigmonastic movements
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a type of movement that occurs in response to touching or shaking a plant
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nyctinastic movements
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plant movements in response to the daily cycle of light and dark
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photoperiodism
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a plants growth in response to changes in the length of days and nights
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critical night length
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specific requiered period of darkness
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short day plant
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flowers when days are short and nights are long
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long day plant
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flowers when days are long and nights are short
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day neutral plants
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not affected by day length
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phytochrome
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light sensitive pigment
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vernalization
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a low temperature simulation for flowering
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biennial
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plant that lives for 2 years
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bolting
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the flowering stem of a plant elongates rapidly in the spring
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fall colors
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caused by photoperiodism
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