Types of Tropism | PHOTO... | THIGMO... | GRAVI... | POINTS.....!!! |
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The effect of gravity on plant growth
What is Gravitropism?
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vertically
To which side will a potted plant grow in the open with sunlight, vertically or horizontally?
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thigmotropism
If the stem of a runner bean plant coils around a pole this illustrates what?
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Upward- against the gravity
Which way does the embryonic shoot grow to exhibit a negative gravitropism?
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Gravity
What is Gravitropism in relation to?
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Thigmotropism
What is a movement in response to touch?
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negative phototropism
What is plant growth that curves away from the light?
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touches
Ex. A flowering plant grows straight up and down until it _______ something, then cells in contact with an object such as a pole or and underground rock, grow less while those on the opposite side elongate.
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Increased auxin concentration
What causes the cells in one area to grow more than cells on the upper side?
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Light
What is phototropism in relation to?
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Phototropism
What is a movement in response to a light stimulus?
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insensitive to light
Roots, depending on the species examined, are negative phototropism or ...
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By building shorter and sturdier plants.
How is cell elongation inhibited?
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positive gravitropism
By growing with gravity downward into the soil the embryonic root exhibits what?
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Touch
What is Thigmotropism in relation to?
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Chemotropism (Chemicals), Traumotropism (trauma), Skototropism (darkness), and aerotropism (oxygen).
What kind of other tropisms are included?
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Stem- this shows positive phototropism
Which part of a plant is most likely to show phototropism?
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one side of an organ elongates faster than the other, and the result is a curving toward or away from the stimulus.
What occurs to one side of an organ vs the other in tropism due to differential growth?
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roots no longer respond to gravity
What happens according to Charles and Francis Darwin if the roots are capped?
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one is related to the oxygen and the other is the actual gravity
What is the difference between aerotropism and gravitropism?
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Growth toward or away from a unidirectional stimulus.
What is Tropism????????
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Occurs because the cells on the shady side of the stem elongate due to the presence of auxin.
What is positive phototropism?
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Thigmomorphogenesis
What is when a plant changes its overall shape due to an environmental touch stimulus called?
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signals from statoliths ( light) will change and redistribute causing roots to bend down and shoot to grow up.
What happens if you place a potted plant on its side?
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Darkness
What is Skototropism?
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