What is tropism
(TROH piz um)?
1. Phototropism
2. Geotropism
3. Thigmotropism
Engage: Warm up question. Show students a photograph that is an example of either photo- geo- or thigmotropism. Have them write the term and describe why that picture is an example of that tropism.
What is Tropism? A tropism (from Greek τρόπος, tropos, "a turning") is a biological phenomenon, indicating growth or turning movement of a biological organism, usually a plant, in response to an environmental stimulus
What are 3 stimuli that produce plant response?
1.
2.
3.
touch (thigmo - tropism)
gravity (geo - tropism)
light (photo - tropism)
Tropisms & Homeostasis
TEST REVIEW
Tropism
Engage: Warm up question. Show students a photograph that is an example of either photo- geo- or thigmotropism. Have them write the term and describe why that picture is an example of that tropism.
Elaborate II: Follow the instructions on pg. 375 (TE). Ask students who has sweated on a hot summer day. Ask students the purpose of sweating (to cool the body). Students work in pairs to place the cards of RM 23 in order. (allow
5 minutes to complete) Walk around and check their work. Review answers before allowing students to glue RM 23 into their science notebook.
Phototropism
What is Tropism? A tropism (from Greek τρόπος, tropos, "a turning") is a biological phenomenon, indicating growth or turning movement of a biological organism, usually a plant, in response to an environmental stimulus
What are 3 stimuli that produce plant response?
1.
2.
3.
touch (thigmo - tropism)
gravity (geo - tropism)
light (photo - tropism)
Geotropism
What is Tropism? A tropism (from Greek τρόπος, tropos, "a turning") is a biological phenomenon, indicating growth or turning movement of a biological organism, usually a plant, in response to an environmental stimulus
What are 3 stimuli that produce plant response?
1.
2.
3.
touch (thigmo - tropism)
gravity (geo - tropism)
light (photo - tropism)
Thigmotropism
What is Tropism? A tropism (from Greek τρόπος, tropos, "a turning") is a biological phenomenon, indicating growth or turning movement of a biological organism, usually a plant, in response to an environmental stimulus
What are 3 stimuli that produce plant response?
1.
2.
3.
touch (thigmo - tropism)
gravity (geo - tropism)
light (photo - tropism)
https://www.youtube.com/watch?v=pi3P3uJOsN4
During Video - Write word, draw picture,
Homeostasis
Homeostasis
Copy table into your science NB and complete it, listing stimuli and responses
STIMULUS
RESPONSE
STRESSFUL SITUATION
POLLEN IN THE AIR
shivering, goose bumps
HUNGER
thirst
SMELL OF FOOD WHEN HUNGRY
HOT ENVIRONMENT
Answer in NB
How do stimulus-response relationships help the body maintain balance?
STIMULUS
1. stressful situation 2. pollen in the air
3. cold environment
4. hunger
5. not enough water 6. smell of food when hungry
7. hot environment
Answer in NB
How do stimulus-response relationships help the body maintain balance?
Response
“fight or flight”
sneezing, coughing
shivering, goose bumps eat food
thirst
salivate
sweating; turn red or pink (blood vessels dilate and bring warm blood closer to surface of skin to allow heat to be given off)