1.7 Transport of Substances in Plant

8/3/2019 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

1.7 Transport of Substances in Plant

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