3.5 - Control Systems Flashcards
Although plants are not as obvious in their reactions to their environment as animals are, they do have responses to specific ______
Stimuli
Phototropism is the movement of ______
Light
Gravitropism is the movement of ______
Gravity
Phototropism is the growth of a plant towards a ______ source
Light
Gravitropism is the growth of a plant in response to the force of ______
Gravity
Stems show ______ phototropism
- movement towards the light
Positive
Roots show ______ phototropism
- grow away from the light
Negative
Stems show ______ gravitropism
- movement against gravity
Negative
Roots show ______ gravitropism
- grow towards gravity
Positive
Tropisms are important ______ to ensure survival of the plant
Control systems
Plants also respond to the amount of ______ and ______ periods
Light
Dark
Tropisms are plant ______ in which the plant grows toward or away from a ______ (ex: plants growing towards the sun)
Responses
Stimulus
______ is responsible for the plant growth response to gravity
Auxin
In the stem - when a plant is placed on its side, more ______ collects in the cells on the stems lower side. These cells then grow longer resulting in the stem curbing upward.
Auxin
In the root - increased auxin concentration inhibits root ______. When a root is placed sideways, auxin collects along the lower side.
Growth
