16.4 Tropisms In Plants Flashcards
What are tropisms
Plant growth responses
What are types of tropism and what do they mean
Phototropism- response to light
Geotropism - response to gravity
Chemotropism - response to chemicals
How do scientists research tropisms
Use seedlings and germinating seeds
What is phototropism related to auxins
The result of auxin across the shoots/roots of its exposed to light that’s stronger on one side
What is the effect of unilateral light on plants
The plant will be partially shaded so auxins will move to the uniluminated side and thus will stimulate cell elongation here, causing it to grow directly towards the light
What hormone is responsible for plants to grow quickly in the dark
Gibberellins
How is geotropims measured
Use a rotating drum - clinostat
Plants are grown in a slowly rotating clinostat so gravitational stimulus is applied evenly on all sides
