Summary
Summary Topic 4 Sustainabilty and Fibres
Edexcel Biology Topic 4 Sustainability and Fibres
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SustainabilityGrow plant decompose
product
-
> - >
-
S.I units
Coppicingplants -toallow treesto reo
a
>
-
Renewable resources
indefinitely without
↳ used out
running
Alternatives >
- regrow , decompose
Plants - animals
↳
requires Hearing
with
knd
-
mixed plastics
Oils
(fossil fuels) & take millions of years
-
to
form
↳ finite resource
↳ are
stronger
Fi bres
Fibres
long strong apered flexible
-
, ,
L
Fiber cells
highly
are
lignified
long and
for strengh j
sustainable
>
- as
they decompose and
regrow
cellulose microfibrils form net like
e .
.
g
a
arrangement
Secondary thickening or
secondary cell wall
is twicker and
lignified.
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