Plant hormones Flashcards
(20 cards)
What is auxin ?
It is a plant hit
one that controls growth near the tips of shoots and roots
What else does Auxin control?
The growth of the plant in response to light and gravity
where is Auxin produced?
auction is producing the tips and move backwards to stimulate the cell elongation process which occurs in the cell just behind the tips
what happens if the tip of a shoot is removed?
No Auxin is available and the shoot may stop growing
What does extra Auxin promote ?
growth in the shoot by inhibits growth in the root – producing the desired result
What happens when a shoot tip is exposed to light?
More auxin accumulates on the die that’s in the shade than the side that’s in the light
What effect does the shoot growing towards light have the on the shoot ?
this makes the cells grow faster on the shaded side so the shoot bends towards the light
What happens when a shoe is growing sideways?
gravity produces an unequal distribution of Auxinin the tip, with more Auxin on the lower side
What does this cause ?
this causes the lowest side to grow faster, bending the shoot upwards
what happens to a shoe growing sidewards?
It will have more Auxin on its lower side
What happens to the rotor with extra auxin ?
it inhibits growth. This means the cells on top Elgate faster and the roots downwards.
What is the first step to investigate plant growth responses ?
Put 19 cress seeds into three different perro dishes, each lined with moist filter paper
What is the second step to investigate plant growth responses ?
shine a light onto one of the dishes from above and two of the dishes from different directions
What is the third step to investigate plant growth responses ?
leave your poor little grass seeds alone for one week until you can observe their responses – you’ll find the seedlings growing towards the light
What is the fourth step to investigate plant growth responses ?
you know that growth responses of grass seed is due to light only, if you control all other variables
How do you control the number of seeds?
Use the same number of seeds in each dish
how do you control the type of seeds?
You seeds that all come from the same packet
how do you control the temperature?
Keep your petri dish in the same place where the temperature is stable
how do you control water?
Use a measuring cylinder data to add the same amount of water
how do you control light intensity?
Keep the distance between the ball and the dish the same
