planetary(OH28 TRANSPIRATION
structural in order certain function
collection of tissues
joined together unit perform
•
organ a to a
→
as .
leaf functions photosynthesis
plant gaseous exchange and transport
•
→
eg : :
,
, structure -
of plant heat
ex te r n al
•
petiole → attaches leaf to stem
lamina / leaf blade Flattened thin allow maximum sunlight
→
•
t to exposure to
leaf veins of phloem ( nutrients) for transport to form main vein Midrib
consist
xylem connect
•
→
+ + -
midrib
•
→ main vein
internal
•
epidermal tissue
→
thin
layer : lets sunlight easily penetrate the leaf
cuticle →
epidermal tissue to prevent loss
•
covers water
palisade mesophyll elongated parenchyma cells
tightly packed with lots of chloroplasts
• →
→
contained in leaf veins
xylem tissue
•
→
brings water and minerals to leaf
•
phloem →
in leaf veins to
carry away products
of
photosynthesis
nutrients
→
transports
mesophyll loosely packed rounded parenchyma
•
→
tissue
spongy
of
large intercellular air spaces ensure movement
gases water
→
easy t vapour
:
→ contain chloroplasts ( not as
many as palisade)
•
lower epidermis → has stomata
flanked
in by guard cells
•
stomata →
pores lower epidermis
and 02 of leaf
guard cells close allow CO2 leaf
•
→
open + to into t water vapour out
structural in order certain function
collection of tissues
joined together unit perform
•
organ a to a
→
as .
leaf functions photosynthesis
plant gaseous exchange and transport
•
→
eg : :
,
, structure -
of plant heat
ex te r n al
•
petiole → attaches leaf to stem
lamina / leaf blade Flattened thin allow maximum sunlight
→
•
t to exposure to
leaf veins of phloem ( nutrients) for transport to form main vein Midrib
consist
xylem connect
•
→
+ + -
midrib
•
→ main vein
internal
•
epidermal tissue
→
thin
layer : lets sunlight easily penetrate the leaf
cuticle →
epidermal tissue to prevent loss
•
covers water
palisade mesophyll elongated parenchyma cells
tightly packed with lots of chloroplasts
• →
→
contained in leaf veins
xylem tissue
•
→
brings water and minerals to leaf
•
phloem →
in leaf veins to
carry away products
of
photosynthesis
nutrients
→
transports
mesophyll loosely packed rounded parenchyma
•
→
tissue
spongy
of
large intercellular air spaces ensure movement
gases water
→
easy t vapour
:
→ contain chloroplasts ( not as
many as palisade)
•
lower epidermis → has stomata
flanked
in by guard cells
•
stomata →
pores lower epidermis
and 02 of leaf
guard cells close allow CO2 leaf
•
→
open + to into t water vapour out
