Plant Movements Flashcards
what does not determine direction of response in nastic movement
direction of stimulus
what does nastic movement involve
asymmetrical/ differential growth or turgor changes
epinasty
upper surface is elongating more than the lower
nyctinasty
leaves horizontal during the day and vertical during the night
thigmonasty
trigger hairs give a response to close
trophic
direction of stimulus does determine the direction of response
phototrophism
directional response to light
what color in light has to be present for the coleoptile to bend
blue
what happens to a plant shaded
the shaded side cells elongate because auxin is light sensitive and moves from the light side to the shaded side
what is negative gravitropism
when the stem grows away from the source of gravity
what is positive gravitropism
when the root grows towards the source of gravity
what does too much auxin do
slows down elongation therefore the bottom of the root has less elongation
what does too much auxin do
slows down elongation therefore the bottom of the root has less elongation
how do plants detect gravity
the statoliths are heavier than contents in cells and fall down to the bottom of the cell
turgor
changes in osmotic pressure on the two sides of an organ
