Plant Hormones Flashcards
What are 3 things plants can sense
Light
Gravity
Touch
What do plants rely on
Hormones
Where in the plant can auxins be found
At the roots and the shoots (tips of the plant)
How do auxins work at the roots
Produce
Dissolve
Diffuse
Inhibit growth
How do auxins work at the shoots
Produce
Dissolve
Diffuse
Stimulate growth
What is phototropism
Response to light
What is geotropism/gravitropism
Response to gravity
Where on a plant will auxins always be produced
On the shaded side
On the lower side
Describe the shoots
Positively phototropic - grow towards the light
Negatively geotropic - grow away from the ground
Describe the roots
Negatively phototropic - grow away from the light
Positively geotropic - grow towards the ground
What 3 plant hormones are used commercially
Auxin
Ethene
Gibberellin
How can auxins be used to kill weeds
Can disrupt a plants growth patterns
Causes it to die
How do you use the technique cutting
Cut a leaf and/or stem
Place it in the soil
Normally nothing would happen and it would die
If you put rooting powder on it
Which contains auxins it will grow and develop onto a plant
What does dormancy mean
Seeds are inactive and do not grow or develop
What does germination mean
Seeds begin to develop and grow
How does gibberellin work
a seed can’t grow without correct conditions
Gibberellin would induce germination in times of a year where it wouldn’t happen
What’s the benefit of gibberellin
Can grow multiple crops per year
Start growing at the same time
What does Ethene in plants do
Stimulates an enzyme which causes the fruit to ripen
When transporting fruit over long periods at a time how does it work without the fruit ripening.
The fruit is picked early
We block its effects so it doesn’t ripen to early
When the food reaches us we use Ethene to ripen the fruit
so it’s ready for sale
Why do we block the fruits effects before transporting
Most plants naturally produce Ethene
