Post on 15-Apr-2017
transcript
Plants Move
TROPISMis a biological phenomenon, indicating growth or turning movement a plant in response to an environmental stimulus
TROPISMPOSITIVE
If the plant moves TOWARD the stimulus
NEGATIVE If the plant moves
AWAY from the stimulus
Phototropism
Movement of plants toward light
Why?Maximize amount of sun for photosynthesis to make their food.
Phototropismhttp://www.youtube.com/watch?NR=1&v=KQOC_bPrqFs&safety_mode=true&persist_safety_mode=1
Gravitropism
http://www.youtube.com/watch?v=mYZXax8V_L0&feature=related&safety_mode=true&persist_safety_mode=1
Movement of plants in response to gravity
Positive is toward gravity (roots grow down)
Negative is away from gravity (shoot, stems, and leaves grow up)
Why?Allows plants to grow properly and get nutrients and sunlight
Hydrotropism
http://virtualastronaut.tietronix.com/textonly/act25/text-plants.html
Movement by plants toward water.
Why?Roots search for and grow toward water, because it is needed for photosynthesis and to support cell structure.
Thigmotropism
http://www.youtube.com/watch?v=8HeedWWe6VA&feature=related&safety_mode=true&persist_safety_mode=1
Plants moving in response to touch.
Positive is toward touch (vines wrap around structures)
Negative is away from touch (some plants close up when touched)
Why?to support leaves as they grow higher to reach the sun to make more food (photosynthesis).
Gravitropism Gravity causes a response in plant growth
In the picture above, which part of the plant exhibits positive tropism, and which exhibits negative tropism?
Hydrotropism The way a plant grows or bends in response
to water
Why would it be important for some parts of a plant to be pulled toward water?
Thigmotropism Plants bend and grow because of touch.
What are some other ways a plant can be “touched”?
Phototropism The way a plant grows or bends in response
to light.
Why do you think sunflowers were given their nickname?
Hydroptropism
Gravitropism
Phototropism
Gravitropism
Phototropism
Thigmotropism
TROPISM QUIZ
Identify the type of tropism in the following pictures
1
2
3
4
5
6
7
http://www.youtube.com/watch?v=Ze8NV7cvW8k&feature=results_main&playnext=1&list=PL5464C68C7644DD4D&safety_mode=true&persist_safety_mode=1
8
9
10
http://www.youtube.com/watch?v=8SkKuwbmR5Y&feature=related&safety_mode=true&persist_safety_mode=1
11
http://www.youtube.com/watch?v=9sggQQuBU40&feature=related&safety_mode=true&persist_safety_mode=1
12
13
http://www.youtube.com/watch?v=mYZXax8V_L0&safety_mode=true&persist_safety_mode=1
14
15
http://www.youtube.com/watch?v=8HeedWWe6VA&feature=fvsr&safety_mode=true&persist_safety_mode=1
16
http://www.youtube.com/watch?v=FC5eBkDJbMs&feature=BFa&list=PL5464C68C7644DD4D&lf=results_main&safety_mode=true&persist_safety_mode=1
17
18
http://www.youtube.com/watch?v=Zq3UuHlPLQU&feature=related&safety_mode=true&persist_safety_mode=1
19
20
http://www.youtube.com/watch?v=frmyzIhD29Q&safety_mode=true&persist_safety_mode=1