Summary

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! :)

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Uploaded on August 10, 2023
File latest updated on August 12, 2023
Number of pages 7
Written in 2022/2023
Type Summary

module 5
plant responses
tropisms
phototropism
geotropism
gibberellins
seed germination
growing in the dark
stem elongation
auxins
plant growth
apical dominance
abiotic stre
investigating phototropism

Study Level
A/AS Level
Examinator
OCR
Subject
Biology A
Unit
Plant Responses

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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

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Summary

Summary OCR A-Level Biology - Plant Responses Mind Map

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