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Transport in Flowering Plants - Gabrielle Abrahams




Transport in Flowering Plants

Plants are defined as `multicellular photosynthetic eukaryotes' as include mosses, ferns,
conifers, and flowering plants.

All flowering plants (angiosperms):
Develop from embryo protected by the tissues of the parent plant (seed inside a
parent)
Have starch as their main…

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Transport in Flowering Plants - Gabrielle Abrahams




Dermal - outer covering on herbaceous - as it has no wood there is no support
structure, epidermal cells are able to secrete a waxy cuticle
Vascular - xylem, phloem, cambium, parenchyma - transport




Water
and




minerals from the soil enter the plant…

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Transport in Flowering Plants - Gabrielle Abrahams




exchange occurs, a little water vapour may be lost here.

As a result of transpiration, water moves through the plant from roots to leaves and is lost
into the air as water vapour. This is known as the transpiration stream. 98% of the…

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Transport in Flowering Plants - Gabrielle Abrahams




Internal factors affecting transpiration
Leaf surface area - the larger the surface area the faster the transpiration rate
o There is more surface with stomata that is exposed to the air
Distribution of stomata - the more large stomata the faster the transpiration…

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Transport in Flowering Plants - Gabrielle Abrahams




Rolled leaves - Leaf rolls so lower epidermis is not exposed to atmosphere and
water vapour is enclosed in the leaf. Protects stomata from the wind

Measuring transpiration
A potometer measures water uptake and estimates the rate of transpiration. A potometer
can be…

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Transport in Flowering Plants - Gabrielle Abrahams




The apoplast pathway - water passes along the cellulose cell wall as its structure has no
resistance to water. Water continues to pass through cell walls until it reaches the
endodermis. The cell wall of the endodermis contains a casparian strip, which is…

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Transport in Flowering Plants - Gabrielle Abrahams




form a continuous tube once the end walls of each cell break down. There is
therefore no barrier to the movement of water and minerals from the roots to the
top of a plant. The loss of cell contents means more empty space…

Page 8

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Transport in Flowering Plants - Gabrielle Abrahams




Translocation in the phloem - the mass flow hypothesis
Translocation is the movement of solutes from place to place. For
example, sucrose, produced during photosynthesis, is translocated from
the leaves to other parts of the plant in the phloem. Phloem is involved
in…

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