Unit XI: Plant Structure and Function. Plant biology, perhaps the oldest branch of science, is driven by a combination of curiosity and need- curiosity about how plants work and a need to apply this knowledge judiciously to feed, clothe, and house a burgeoning human population.
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Plant biology, perhaps the oldest branch of science, is driven by a combination of curiosity and need- curiosity about how plants work and a need to apply this knowledge judiciously to feed, clothe, and house a burgeoning human population.
Genomic Sequence of 5 Chromosomes of Arabidopsis
St: “typical” plant cells
Fu: perform most metabolic functions
Ex: fleshy tissue of most fruit
St: unevenly thickened primary walls
Fu: provide support but allow growth
in young parts of plants
St: hardened secondary walls
Fu: specialized for support; dead
Ex: fibers (hemp/flax); slereids
(nut shells/seed coats)
soil --> epidermis --> root cortex --> xylem
Lateral transport of soil
solution alternates between
apoplastic and symplastic
routes until it reaches the
The Casparian strip is a belt
of suberin (purple) that
blocks the passage of water
and dissolved minerals.
Only minerals that are already
in the symplast or enter that
pathway by crossing the
plasma membrane can detour
around the Casparian strip and
pass into the stele.
Summary of uptake
of soil animation
Water vapor diffuses from the moist
air spaces of the leaf to the drier air
outside via stomata.
Tension is created by the evaporation
of water and pulls water from
locations where hydrostatic pressure
is greater (xylem).
Transpirational pull draws water out
of xylem and through mesophyll
tissue to the surfaces near stomata.