Plant hormones Flashcards
What is phototropism?
Plant shoots growing towards the light
What is the name of the hormone produced in shoot tips and roots?
Auxins
What do auxins trigger in shoots?
Cell growth
When a shoot grows towards the light, what kind of tropism is demonstrated
Positive phototropism
When a root grows away from the light, what kind of tropism is demonstrated?
Negative phototropism
When a root grows down (with gravity), what kind of tropism is demonstrated?
Positive gravitropism
When a shoot grows up (against gravity), what kind of tropism is demonstrated?
Negative gravitropism
How does auxin cause a plant to against gravity?
Auxin moves to lower side -> elongation of cells
How does auxin cause a shoot to grow towards light?
Auxin moves to shady side -> elongation of cells
State three uses of auxins
1) weed killer
2) rooting powder
3) tissue culture
Which transport method is used to move auxin from the tip of a plant to other parts?
Diffusion
Which plant hormone initiates seed germination?
Gibberellins
Which hormone causes cell division and fruit ripening?
Ethene
State one use of ethene
Controlling fruit ripening
State three uses of gibberellins
1) end seed dormancy
2) promote flowering
3) increase fruit size
State the names of 3 plant hormones
1) Ethene
2) Gibberellins
3) Auxin
