Exam 2: Plant Growth
Botany 130 with Christopherson/emshwiller at University of Wisconsin - Madison
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What is phototropism?
growth towards or away from light
What is growth?
the irreversible process of elongation
What is heliotropism?
orienting leaves/flowers towards or away from the sun
Is heliotropism reversible or irreversible movement?
reversible
What are circadian rhythms?
Regular patterns that follow a 24 hour cycle - independent of day/night.
What is photoperiodism?
Biological responses to the proportion of light in the 24-hour cycle - a response to seasons.
What is phytochrome?
a molecule responsible for detecting light and dark
Where in the plant do you find phytochrome?
in the leaves
What is thigmonastic movement?
reversible movement in response to mechanical stimuli that is irrelevant to the origin of stimulus
What causes thigmonastic movement? (What happens in the plant to cause the movement?)
The movement happens due to changes in tugor pressure.
What is thigmomorphogenesis?
Growth response that shapes the plant due to mechanical stimuli.
What is thigmotropism?
Another growth based on touch that allows roots to grow around something, and shoots in vine-like plants to grab on to things.
How do shoots respond to gravity?
They always grow against gravity.
How do roots respond to gravity?
They always grow with gravity.
About this deck
About StudyBlue
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