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Plants Move
TROPISMis a biological phenomenon, indicating growth or turning movement a plant makes in response to an environmental stimulus
Tropismhttp://plantsinmotion.bio.indiana.edu/plantmotion/movements/tropism/tropisms.html
Phototropism
Movement of plants toward light to maximize amount of sun for photosynthesis to make their food.
Heliotropism http://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 gravityPositive is toward gravity (roots)Negative is away from gravity (shoot: stems and leaves)
Hydrotropism
http://virtualastronaut.tietronix.com/textonly/act25/text-plants.html
Movement by plants toward water.
Seen in roots “searching” and growing toward water which 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.
Seen in vine plants as they wrap around other plants or structures to support leaves as they grow higher and higher to reach the sun to make more food (photosynthesis).
Plant Tropisms
Tropism: the way a plant grows in response to stimuli in the environment.1) Phototropism: growth response to
light Plants bend towards light
2) Gravitrophism: growth response to gravity plant roots grow down with gravity,
shoots (stems) grow up against gravity and out of the soil.
3) Thigmotropism: growth response to touch vines grow up around trees, Venus
flytrap closes when leaves are touched
Slide # 23
A.
What type of tropism is shown in these pictures?
DC
B
FE.
Slide # 23
Gravitropism
What type of tropism is shown in these pictures?
ThigmotropismPhototropism
Phototropism
ThigmotropismGravitropism
ReviewAdaptations for Life on Land
Leaves – absorb energy from sun; centers for photosynthesis and gas exchange
Roots – anchor plants; absorb H2O & minerals from soil
Stems – hold plant upright; transport food & water along the plant
Flowers – produce sperm & eggs for reproduction in angiosperms
Seeds – protect embryo from damage and water loss; dispersed away from parent plant
Fruits – method of seed dispersal in flowering plants