1201881
Descrição
Mapa Mental por issyapsmith, atualizado more than 1 year ago
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Criado por issyapsmith
mais de 11 anos atrás
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Leaf adaptations
for photosynthesis
- LARGE
SURFACE AREA,
For absorbing light
and carbon dioxide
- SUPPORTED BY A PETIOLE,
usually arranged around the
stem in such a way that they all
recive light
- HAVE MANY STOMATA,
in the lower epidermis to
allow carbon dioxide to
diffuse and oxygen to
diffuse out
- THEY ARE THIN,
so carbon dioxide
can diffuse quickly
through the leaf
after it has entered
through the
stomata. Also to
allow sunlight
penertrate all cells.
- AIR SPACES,
in the spongy
mesophyll for
the diffusion
od carbon
dioxide and
oxygen to
and from all
cells
- PALISADE CELLS,
where most
photosynthesis
occurs is situated
towards the more
brightly lit the upper
side of the leaf
- PALISADE CELLS ARE ARRANGED END ON,
to keep as few cell walls between the
sunlight and and chloroplasts
- NO CHLOROPLASTS IN THE EPIDERMAL
CELLS, to allow sunlight to penertrate to the
mesophyll layer
- XYLEM VESSELS TO SUPPLY WATER,
to the leaf cells, some of which will be
used in photosynthesis
- PHLOEM VESSELS,
to take away sucrose
and other organic
products of
photosynthesis
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