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What is a clinostat?
A revolving platform to equalize light and gravity.
Define chemotropism.
Growth response to chemicals.
What is geotropism?
Growth response to gravity.
What is a growth regulator?
A substance that controls the growth of a plant.
Define hydrotropism.
Growth response to water.
What does it mean if a plant response is negative?
It grows away from the stimulus.
Define phototropism.
Growth response to light.
What does it mean if a plant response is positive?
It grows towards the stimulus.
What is a stimulus?
A factor that causes a response.
Define thigmotropism.
Growth response to touch.
What is tropism?
The growth response of a plant to a stimulus.
What was the control in the IAA experiment?
A petri dish containing water with no IAA solution.
What effect did low concentration of IAA have on root growth?
It promoted root growth.
What does serial dilution involve?
Making a series of diluted solutions by decreasing concentration in a step-wise manner.
What is the role of auxins?
Cell elongation.
What are gibberellins responsible for?
Breaking dormancy, cell elongation, and division.
What is the function of abscisic acid?
It inhibits shoot growth.
What does ethylene influence?
Ageing processes in plants.
What is the significance of auxins in rooting powders?
They are used to promote root development in plant cuttings.
How do plants protect themselves from herbivores?
Through adaptations such as thorns, stinging cells, or toxic chemicals.
Where is auxin produced in plants?
In the apical meristems.
What is apical dominance?
The inhibition of lateral bud growth by high auxin concentration at the shoot tip.
What happens to lateral buds when the apical bud is removed?
They begin to develop and the plant becomes bushy.
What was the purpose of placing one set of seeds in a clinostat during the phototropism experiment?
light exposure was equal from all sides
What conclusion can be drawn from the phototropism experiment with the seedlings?
Seedling shoots are positively phototrophic.