1. Tropisms

2. All living organisms, including plants, respond to stimuli

3. stimulus
vocabulary
word!
stimulus - anything that causes a reaction or change in an organism.

4. response response - an organisms reaction to a stimulus. vocabulary
word!
response - an organisms reaction to a stimulus.

5. stimulus/response

6. internal stimulus
vocabulary
word!
internal stimulus – a stimulus coming from inside an organism
chemicals and hormones
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7. external stimulus
vocabulary
word!
external stimulus – stimulus coming from outside an organism
light, touch, water, gravity, electricity, temperature, darkness etc…
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8. tropism
vocabulary
word!
tropism - automatic movement by an organism toward or away from a stimulus
positive (toward)
negative (away)

9. phototropism

10. phototropism a response toward or away from light
positive – toward light
negative – away from light

11. phototropism
Find the square on your cut-out page that shows phototropism.
On the line above the picture, write phototropism
On the lines under the picture, write the definition - a response toward or away from light
Paste it onto your notes
If you have time, you can color the picture

13. gravitropism https://www.youtube.com/watch?v=mYZXax8V_L0

14. gravitropism a response toward or away from gravity
positive - roots growing down
negative - stems growing up

16. hydrotropism response toward or away from water
Usually occurs only in the roots

18. Thigmotropism https://www.youtube.com/watch?v=9sggQQuBU40

19. thigmotropism
a response toward or away from touch
Vines
Venus flytrap

21. Emergence of Seedlings
Unbalanced forces allow seedlings to push their way through the soil and sometimes rock

23. Turgor Pressure

24. Turgor Pressure force in the form of water pressure
helps some plants stand upright.
In animals, it also helps blood move around the body

27. emergence of seedlings
thigmotropism
phototropism
geotropism
organism’s response to light
organism’s response to gravity
organism’s response to touch
hydrotropism
turgor pressure
emergence of seedlings
organism’s response to water
pressure inside the plant that allows it to stand up.
seedling pushing up through the ground