Tropisms. Stimulus Change in an organism’s surroundings that causes a response –Internal...
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Transcript of Tropisms. Stimulus Change in an organism’s surroundings that causes a response –Internal...
![Page 1: Tropisms. Stimulus Change in an organism’s surroundings that causes a response –Internal (chemicals and hormones) –External (light, touch, water, gravity)](https://reader031.fdocuments.in/reader031/viewer/2022020308/5697bfb61a28abf838c9e68c/html5/thumbnails/1.jpg)
Tropisms
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Stimulus
• Change in an organism’s surroundings that causes a response– Internal (chemicals and hormones)– External (light, touch, water, gravity)
• All living organisms, including plants, respond to stimuli
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Response
• Reaction of a living thing to a stimulus
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Stimulus/Response
Stimulus
Response
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Internal Stimulus/Response
• Stimulus or response happens inside the organism
• Chemicals and hormones
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External Stimulus/Response
• Stimulus or response occurs outside the organism
• Light, touch, water, gravity, electricity, temperature, darkness etc…
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Tropism
• Automatic movement by an organism toward or away from a stimulus– Positive (toward)– Negative (away)
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Phototropism• When a plant or animal moves toward or
away from light– Positive – toward light– Negative – away from light
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Phototropism
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Phototropism
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Geotropism
• Also called gravitropism• Plants or animals response to gravity
– Positive - roots growing down– Negative - stems growing up
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Geotropism
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Geotropism
http://plantsinmotion.bio.indiana.edu/plantmotion/movements/tropism/tropisms.html
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Hydrotropism
• Directional movement toward water– Usually occurs only in the roots
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Hydrotropism
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Thigmotropism
• When an organism responds to touch– Vines– Venus flytrap
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Thigmotropism
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Thigmotropism
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Emergence of Seedlings
• Unbalanced forces allow seedlings to push their way through the soil and sometimes rock
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Turgor Pressure
• Force in the form of pressure – helps some plants stand upright.– In animals, it also helps blood move around the
body
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Turgor Pressure
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Turgor Pressure
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phototropism
turgor pressure
hydrotropismemergence of seedlings
thigmotropismgeotropism
organism’s response to
light
organism’s response to
gravity
organism’s response to
touch
seedling pushing up through the
ground
organism’s response to
water
pressure inside the plant that
allows it to stand up.