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26 Cards in this Set
- Front
- Back
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What is the growth response involving movement of a plant part in response to an external stimulus?
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tropism
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What type of tropism moves toward the stimulus?
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positive
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What type of tropism moves away from the stimulus?
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negative
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What is the growth of a plant in response to a directional light?
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phototropism
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Shoots bend towards what color of light?
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blue
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What is a light-absorbing substance?
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pigment
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What is the main photosynthetic pigment; occurs in all photosynthetic eukaryotes?
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chlorophyll-a
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What are not directly involved in photosynthesis, transfers captured light energy to chlorophyll a?
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accessory pigments
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What type of accessory pigments are involved in plants, green algae, and eugienoids?
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chlorophyll-b
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What type of accessory pigments are lipid-soluble and present in chloroplasts?
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carotenoids
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What protects chlorophyll molecules from light damage?
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antioxidants
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What colors are chlorophyll a and b?
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blue and red
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What colors are carotenoids?
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blue and green
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What does far-red light indicate to plants/
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shade
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What do species adapted to high light habitats do in low light conditions?
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elongate their stems
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What is the response by an organism to relative lengths of day and might?
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photoperiodism
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What allows plants to respond to seasonal changes, synchronize flowering with pollinator, and trigger seed germination?
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photoperiod
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Which category of plants flower only when days are longer than a critical period, usually in midsummer?
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long-day
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Which category of plants flower only when days are shorter than a critical period, spring, late summer or fall?
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short-day
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Which category of plants flower irrespective of photoperiod?
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day-nuetral
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What is the pigment that is a specialized light receptor?
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phytochrome
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What is the hypothesis that says starch-storing organelles called amyloplasts are the primary gravity sensors in plant cells?
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Statolith
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What are the series of events that occur between stimulus and response, and involves conversion of one type of energy to another?
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signal transduction
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light energy--> chemical energy
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phototropism
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mechanical energy--> chemical energy
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heliotropism
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What is initiated by contact with a solid object and caused by uneven rates of growth?
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coiling of tendrils
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