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Paper 1
Organisation
Plant Tissue
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Biology > Paper 1 > Organisation > Plant Tissue
8 cards
Cards (26)
Photosynthesis takes place in
leaves
Leaf
A
plant
organ
Leaf
Contains different
tissues
Epidermal cells
Form epidermal tissue
Upper epidermis
Covers the
top
of the leaf
Lower
epidermis
Covers the
bottom
of the leaf
Epidermis
Protects the
surface
of the leaf
Upper epidermis
Transparent
, allows
light
to pass through
Waxy cuticle
Thin layer of
oily
material covering the upper epidermis, reduces
water evaporation
Stomata
Tiny pores in the
lower
epidermis, allow carbon dioxide in and oxygen out, help control
water vapour loss
Guard cells
Found on either side of the
stomata
Palisade
mesophyll
Packed with
chloroplasts
, site of
photosynthesis
Spongy mesophyll
Full of
air
spaces, allows
gas
exchange
Xylem
Transports
water
and
dissolved
mineral ions from roots to leaves
Phloem
Transports
dissolved
sugars produced by
photosynthesis
from leaves to rest of plant
Translocation
Movement of
sugars
through
phloem
tissue
Meristem
tissue
Contains
stem
cells that can
differentiate
into different plant tissues, found in growing tips
This diagram shows a
cross
section of a leaf
A)
cuticle
B)
upper epidermis
C)
chloroplasts
D)
vacuole
E)
xylem
F)
vein
G)
phloem
H)
lower epidermis
I)
cuticle
J)
air channel
K)
stoma
L)
guard cells
M)
spongy mesophyll
N)
vertical palisade cell
14
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