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