Summary OCR A-Level Biology - Plant Responses Mind Map
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Course
Plant Responses
Institution
OCR
Hand-written summary mind maps on the whole of Plant Responses in Module 5 - Communication, homeostasis and energy, OCR A-Level Biology (H420). This includes an overview on tropisms; gibberellins; auxins; abiotic stress; herbivory; commercial uses.
Happy revising! :)
a
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removing shoot tip EXPICIRCIiO
- a a
bonds between cellulose stopped phototropic tip detect
microfibrils loosened, making response to unidirectional ·tip produc
go cell walls more flexible
- -
light stimuli messenge
IAA
moves down stem
e Darwin (1880)
. -:
&
via diffusion/active transport IAA
activates expansies
⑳. I
to stimulate elongation growth proteins in cell walls
o a eSun-uniform IAA
concentrations
opaque
on shoot
lightcap placed
tip to ensure
A canxinsynthesised phototropics
causes uneven grote results not due to
on
inve
shOOt tIDS
I
plantgrowthin response to 2, AAmoves across plant
from
wounding plant
o
I lightstimulus shady
phototropicin
the sunny side to side
Pho
G S
↳
roots negatively
=
phototropic higher IAA
⑧ e
not
as grow concentrations on
positively
away from lightshoots: shaded side, causes faster rate
phototropic as grow of
cell elongation explanation:
towards light & ·tip detects light
shoot bends towards the light stimulus plac
to maximise photosynthesis gela
cell elongation causes
shoot to gela
grow
upwards
higher IAA concentrations RLC
at 2
theSPER cuts
E
causes higher rate of
cell elongation tapisms
& growthmovement ofparts of plants in response to directional
shootsnegatively
-
gravity causes IAA stimuli (come from a particular direction ( E
geotropic as grow
to accumulate at ·
up away from pull
lower side of shoot th
ofgravity
e hydrotropiem in
ensures roots/shoots
↓ root following centre plant growth in response to
from germinating of gravity helps to water stimulus
ed
, ·
amylase enzyme synthesised
d
increase transcription of
mRNA
coding for amylase
activated embryo
stimulates gibberellin
d
embryo production gibberellins diffuse into
seed absorbs water in
d Galeurone layer
H20 correct environmental
&
gibberelling conditions to start
seed amylase hydroly
amylase permination germination s
soluble maltose
starch - G
erwater
ICIItOSe ABA seeds shed for parent
glucose is transportedmaltose co
S
9/UCOSe Hormones plants are in a state to the embryo to be
I respired b
helps seeds survive
of
dormancy
harsh conditions until contain very dormancy broken and
optimum for successful andare metabolically energy provided so
germination inactive embryo can grow
plant
responses
E
gibberellin levels fall to
slow upward growth and save gibbereline
resources when stems exposed
to light gardeners can
e Force' growth paps between leaves on
es
in plants via higher concentration= low
gibberelling etiolation longer internodes sh
in
cause extreme
growing rapid upward growth
e &
S
internode in plants as a result helps plants grow gibberellin concentrations
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