5.1.1 plant responses Flashcards
Auxins in geotropism
low concentration of auxins in root increases root growth
high auxin concentration inhibits cell elongation in the roots
apical dominance
auxin collect at apex of shoot causing apical dominance
means inhibition of side shoots
exists so when plant is young it grows straight up to get as much light as possible
state name of plant hormone that inhibits root growth
auxin
state example of a response that plants use against herbivory
production of poisons,toxic compounds
folding in response to touch
thorns
spines
what do gibberelins do
promote stem elongation by stimulating cell elongation and division
seed germination
promotes hydrolysis of starch
what do auxins affect lateral shoots/branches
maintain apical dominance to inhibut lateral growth
how do auxins affect leaf fall/drop
slow it down as inhibits the production of ethene from increasing
what does ethene do
increase fruit ripening
why is gibberelin classed as plant hormone
its a chemical messenger produced in one part of the plant but effects another part
acts over a long period of time
