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Plant Responses to the environment “Tropisms”
What is a Tropism?
 Tropism comes from the Greek word for “_________________”

So when an organism exhibits a tropism it either has a ____________ turning (___________ the source) or a
____________ turning (________ from the source)

Many organisms have tropisms
What kinds of tropisms do plants have?
 Plants have 4 kinds of tropisms that we will learn about
Tropism
Root word
Root word
Leaves and stem
meaning
reaction
Phototropism
Gravitropism
Light
“Gravi”
none
Negative
Away from gravity
Hydrotropism
Thigmotropism
Roots reaction
Picture
Plant Adaptations - When tropisms help survival
 Sometimes plants can’t get all the resources they need.
 Over long periods of times tropisms ____________ into _____________ for survival
 Cacti have taken ___________________________ to an extreme!
 Cacti live in VERY ___________, Very ___________ conditions so they have
modifications to help them cope with the weather
 Their roots are _______________ and shallow to seek out water
 They have also modified their _________________ down into to tiny thorns to keep the
water from ______________________
 And their stems are filled with ________________ to store water
 Venus Fly Traps and other carnivorous plants have taken ____________________ to an
extreme!
 They live in _________________________ soil and can’t get enough nutrients from the soil
 They use their touch sensitive fibers to know when and ___________ lands on their traps
and then they close, ____________ the insect and suck up all the delicious
_______________ from the insect
Qu e s t i o n 1
Which of the following is false about tropisms?
A. they can be positive or negative
B. they only occur in plants
C. when organisms move toward or away
D. they are natural occurrences
Qu e s t i o n 2
What does positive phototropism mean?
A. the organism moves toward light
B. moves away from light
C. moves toward the picture
D. moves away from the picture
Qu e s t i o n 3
What does part of the plant has a positive gravitropism?
A. the roots
B. the stem
C. The leaves
D. the flowers
Qu e s t i o n 4
Which tropism would help a cactus survive best?
A. phototropism
B. geotropism
C. hydrotropism
D. thigmotropism
Qu e s t i o n 5
Which tropism is being displayed most here?
A. phototropism
B. geotropism
C. hydrotropism
D. thigmotropism
Qu e s t i o n 6
Which tropism is being displayed most
her e?
A. phototropism
B. geotropism
C. hydrotropism
D. thigmotropism
Qu e s t i o n 7
Which tropism is being displayed most here?
A. phototropism
B. geotropism
C. hydrotropism
D. thigmotropism
Qu e s t i o n 8
What adaptations does this plant have?
A. thick stem to store water
B. tiny leaves to conserve water
C. long roots to search out water
D. all of the above
Qu e s t i o n 9
Where would you most likely find carnivorous plants?
A. nitrogen poor swamps
B. nutrient rich rain forests
C. temperate forest
D. all of the above