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Organelles ONLY in Plant Cell - Coggle Diagram
Organelles ONLY
in Plant Cell
Chloroplasts
largest organelle in
photosynthesising cells
surrounded chloroplast
envelope (double membrane)
inner membrane folds
surround fluid called stroma
starch grains + lipid globules
found in stroma
CHLOROPHYLL
green pigment
found on
thylakoids
system of membranes
stacked together
Each stack = granum
between grana = lamellae
ROLE
trap light energy to
produce carbohydrates
(sugars) from H2O + CO2
through photosynthesis
Cell
Wall
made of cellulose
(polysaccharide)
in microfibrils
CELLULOSE
makes cell wall
laid down
microfibrils
composed β glucose
molecules in straight chain
Tough lattice forms
through H bonds between
chains
PRIMARY
made microfibrils different
and random directions
loose arrangement allows
cell wall expand as cell grows
SECONDARY
forms when cell
full size
microfibrils same
direction
additional layers orientated
different directions to previous
layers
lattice arrangement = strength
ROLE
provides mechanical
strength
and support
prevents cell bursting in
dilute solutions
water can move
freely through it
Middle
Lamella
thin cementing layer
between 2 adjacent cells
made from calcium pectate
Plasmodesmata
gaps in cell wall between 2
adjacent plant cells
ROLE
enables molecules pass
1 cell to neighbouring cell
enables cytoplasm to
run continuously between
adjacent cells
Large Vacuole
stores ions + water
ROLE
keeps cell turgid
therefore gives support