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
*
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
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller aestheticnote. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for £4.49. You're not tied to anything after your purchase.
