1.7 Transport of Substances in Plant
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Transcript of 1.7 Transport of Substances in Plant
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1.7 Transport of substances in
plants
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Necessity
The root absorb water and mineral salts which
are transported upward to the leaves and
other parts of the plant.
Carbohydrates (fr leaves) stem & roots
respiration, growth, storage.
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Necessity
Unlike animals, plants are unable to pump
necessary substances thr great distances,
sometimes requiring the need to defy gravity.
To overcome the problem, plants use a
combination ofroot pressure, capillary action
and transpiration to provide enough force to
transport water to the shoot.
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Vascular Tissue
Xylem and phloem form vascular tissue
Xylem: gives support and transport water andmineral ions from root to upper parts ofplants.
Phloem: transport organic food substancessynthesised by leaves.
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Dicot & monocot root
Dicot root Monocot root
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Dicot and monocot root
Monocot roots-vascular bundlesarranged in a ring.
Dicot roots havetheir xylem (starshape) in the center
of the root andphloem outside thexylem.
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Dicot and monocot stem
Dicot stem Monocot stem
Vascular bundle arranged in a ring
pattern
Vascular bundle arranged in
scattered form
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Dicotyledon leaf
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Dicot leaves
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Monocotyledon leaf
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Structure of xylem vessel
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How does the structure of xylem relate
to transport? Xylem vessels: long, hollow, continuous tubes allow water to flow
continuously.
_______: allow water and mineral salts to pass sideways.
Lignified wall:
a)mechanical support
b) increase the adhesion of water molecules and help the water to riseby capillarity.
Narrowness of the lumen: increase the capillarity forces.
Perforated end wall: provide uninterrupted flow of water up theplant.
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Structure of phloem sieve tube
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How does the structure of phloem
relate to transport?
Phloem sieve tubes transport ________ such assucrose, amino acids and plant hormones.
Consist many of_______ & companion cells.
A sieve tube is a cylindrical tube made up ofelongated living sieve tube cells.
Sieve tube joined end to end facilitate thelongitudinal flow of the organic substances.
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The end walls of each sieve tube element areperforated by pores forming ________.
Strands of cytoplasm passing through thepores of the sieves plates help transport
materials from cell to cell.
Sieves tubes are kept alive and supported in
their function by ____________.
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Question 1
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Question 2
What is the aim of immersing the roots of a
balsam plant into a beaker of red ink for a few
hours?
a) To stain the phloem tissues
b) To stain the xylem tissues
c) To stain the vascular bundlesd) To stain the sieve tubes
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Question 3