, beaches &
⑤
This helps them
to survive for
longer-greater
chance of them
J
- reproducing
RESPONSES TO ABIOTIC STRESS
Alkaloids-nitrogenous
J
butter tasting
metabolism
S
compounds that interfere with
,
E .
g Caffere toxic to fungit visects
!
.
Tannins-bitter tasting puenoic compounds
that buid to digestive enzymes produced wi
Saliva viactivate them . t .
g . tea
.
pheromones chemicals released
-
that
affect behaviour of other members of
Whe same species
.
↳ E .
.
g If a maple tree is attacked by
insects ,
it releases pheromones which are
absorbed by the leaves on other .
branches
This causes the leaves to make callose
to protect them S
Mimosa Pudica is a plant that folds
&
un response to touch It contals an .
alkaloid The stem has sharp prickles
.
If the leaves are touched , they collapse,
frightening large herbivores dislodging
Small visects which have landed on the
leaves The leaf recovers .
after 10 muintes
because of potassium ion is water
movement -
This is a nastic response (non-
directional) .
TROPISMS = directional response to stimuli
·
phototropism = growth in response to light
·
geotropism : growth in response to gravity
·
chemotropism = growth hi response to chemicals
·
Thigmotropism = growth in response to
touch
, Darwin's investigations
into phototropism
② If thetip
~is
of
cut
the shoot
off the
①shoots light -
is still
,
sunung ou
normally it , but i
grow doesn't bend .
towards ↳ So, the tip
right of the Shoot
must detect
Light or
Y
Produce
aux wi
⑤
If the Shoot
Boysen-Jensen's -
his is covered
,
the Shoot
investigations into
doesn't bend
.
phototropism So it must be
unowed
-
un the
detection of
-O when we
Light
put the mica
on the suaded
side the shoot ,
didn't bend &
because anxu
-
C
2
Couldn't pass
down the
shaded side +
⑪ cause
elongation
A thin layer
of mica (material
that blocks movement ③ Gelatin allows
of chemical messengers)
chemical messengers
was put on the to pass through .
tip
S
the shoot
uminated side of The of
wasout off
the shootI it bend towards &
gelatin was placed
the light on top of the cut
Shoot , and tip
replaced (put&
on top
of genatur) ,
when
right was shone on
Mis the shoot bent
towards light
↳ this is because
The auxai could pass -
through the gelati
⑤
This helps them
to survive for
longer-greater
chance of them
J
- reproducing
RESPONSES TO ABIOTIC STRESS
Alkaloids-nitrogenous
J
butter tasting
metabolism
S
compounds that interfere with
,
E .
g Caffere toxic to fungit visects
!
.
Tannins-bitter tasting puenoic compounds
that buid to digestive enzymes produced wi
Saliva viactivate them . t .
g . tea
.
pheromones chemicals released
-
that
affect behaviour of other members of
Whe same species
.
↳ E .
.
g If a maple tree is attacked by
insects ,
it releases pheromones which are
absorbed by the leaves on other .
branches
This causes the leaves to make callose
to protect them S
Mimosa Pudica is a plant that folds
&
un response to touch It contals an .
alkaloid The stem has sharp prickles
.
If the leaves are touched , they collapse,
frightening large herbivores dislodging
Small visects which have landed on the
leaves The leaf recovers .
after 10 muintes
because of potassium ion is water
movement -
This is a nastic response (non-
directional) .
TROPISMS = directional response to stimuli
·
phototropism = growth in response to light
·
geotropism : growth in response to gravity
·
chemotropism = growth hi response to chemicals
·
Thigmotropism = growth in response to
touch
, Darwin's investigations
into phototropism
② If thetip
~is
of
cut
the shoot
off the
①shoots light -
is still
,
sunung ou
normally it , but i
grow doesn't bend .
towards ↳ So, the tip
right of the Shoot
must detect
Light or
Y
Produce
aux wi
⑤
If the Shoot
Boysen-Jensen's -
his is covered
,
the Shoot
investigations into
doesn't bend
.
phototropism So it must be
unowed
-
un the
detection of
-O when we
Light
put the mica
on the suaded
side the shoot ,
didn't bend &
because anxu
-
C
2
Couldn't pass
down the
shaded side +
⑪ cause
elongation
A thin layer
of mica (material
that blocks movement ③ Gelatin allows
of chemical messengers)
chemical messengers
was put on the to pass through .
tip
S
the shoot
uminated side of The of
wasout off
the shootI it bend towards &
gelatin was placed
the light on top of the cut
Shoot , and tip
replaced (put&
on top
of genatur) ,
when
right was shone on
Mis the shoot bent
towards light
↳ this is because
The auxai could pass -
through the gelati
