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14 Cards in this Set

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Define a hormone
chemical that is produced in one part of an organism and transported to another part where it causes physiological change
Compare and contrast tropic responses and nastic movements
Nastic movements are reversible, whereas tropic responses are not. Nastic movements are not dependent upon the direction of the stimulus, whereas tropic responses are.
Explain how a plant can bend toward sunlight. What term describes this response?
A plant can bend toward the light as a result of cell elongation on the side of the stem away from the light. It is called phototropism.
Name one plant hormone and describe how it functions
Auxins cause stem elongation by loosing the fibers in the cell wall to make them stretch.
Explain why gardeners often remove stem tips of chrysanthemum plants during early summer.
to promote lateral branching, which increases the number of flowering stems.
One technique that has been used for years to ripen fruit is to put a ripened banana in a paper bag with the unripe fruit. Infer what happens inside the bag.
Ripe fruits release ethylene gas that stimulates the ripening of other fruits
Explain how you would design an experiment to investigate the effects of different colors of light on the phototropism of a plant.
Expose identical plants to different color of light for 24 hours and measure the response. Be sure to have a control (plain light/sunlight).
chemical produced in one part of an organism and transported to another part, where it causes a physiological change.
hormone
group of plant hormones that promote cell elongation.
auxin
group of plant hormones that cause plants to grow taller by stimulating cell elongation.
gibberellins
group of hormones that stimulate mitosis and cell division.
cytokinin
plant hormone that promotes the ripening of fruits.
ethylene
growth response of a plant to an external stimulus.
tropism
responsive movement of a plant not dependent on the direction of the stimulus.
nastic movement