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Plant Responses
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Plant ProcessesPlant Processes88thth 15.2 Plant Responses 15.2 Plant Responses
Plant ResponsesPlant Responses Tropism – response of a plant to an Tropism – response of a plant to an
outside stimulusoutside stimulus Stimulus that affects a plants Stimulus that affects a plants
growthgrowth Light, heat, moisture, gravity, Light, heat, moisture, gravity,
electricity, touch and chemicals.electricity, touch and chemicals. Positive - grows toward stimulusPositive - grows toward stimulus Negative – grows away from Negative – grows away from
stimulusstimulus
Plant ResponsesPlant Responses
Plant ResponsesPlant Responses PhototropismPhototropism GravitropismGravitropism ThigmotropismThigmotropism Auxin – plant hormone that Auxin – plant hormone that
lengthens cellslengthens cells Ethylene – plant hormone that Ethylene – plant hormone that
causes fruit to ripencauses fruit to ripen
Plant ResponsesPlant Responses
Plant ResponsesPlant Responses Photoperiodism – plants response to Photoperiodism – plants response to
the number of hours of daylight and the number of hours of daylight and nightnight
Long day plants - petunias, lettuce, Long day plants - petunias, lettuce, wheat, barley, carnation, radish, wheat, barley, carnation, radish, tobaccotobacco
Short day plants – onion, sugar cane, Short day plants – onion, sugar cane, blueberry, rhododendron, marijuanablueberry, rhododendron, marijuana
Day neutral plantsDay neutral plants
Plant ResponsesPlant Responses