Page 141 - (DK) The Ultimate Visual Dictionary 2nd Ed.

PHOTOSYNTHESIS
CROSS-SECTION THROUGH LEAF
Christmas rose
(Helleborus niger) Cuticle (waterproof covering)

Upper (adaxial)
epidermis (outer Cell wall
layer of cells)
Cytoplasm
Vacuole
Chloroplast
Palisade mesophyll (photosynthetic
(tightly packed layer organelle)
of photosynthetic
tissue) Nucleus
Intercellular
space

Sclerenchyma
(strengthening
tissue)
Xylem (tissue
that transports
water and
mineral salts)
Spongy mesophyll
(loosely packed layer Phloem (tissue
of photosynthetic that transports
tissue) sugars and
other nutrients)
Vein

Lower (abaxial)
epidermis (outer
layer of cells) Parenchyma
(packing
Guard cell tissue)
(controls opening Stoma
and closing of (pore) Substomatal
stoma) chamber
INTERNAL VIEW OF CHLOROPLAST
Lamella
Granum (membrane of Thylakoid
(stack of thylakoids that thylakoid) (flat sac of
hold chlorophyll granum)
molecules in position)
Deoxyribonucleic
Stroma acid (DNA)
(watery matrix) strand

Outer Starch grain
Chloroplast membrane
envelope
Inner
membrane

Stroma thylakoid
Ribosome (link between grana)
(site of protein
synthesis)

139