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Tensile strength of plant fibres CPAC 8
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- PEARSON (PEARSON)
Full CPAC 8 write up which achieved passing grade and fulfilled all necessary criteria for Biology Edexcel
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Name: Hiba Majid 12E (P:\Science\Mr Alim\Year 12\AS Biology)Core Practical 8
Title Plant fibre tensile strength
SCIENTIFIC RESEARCH (REFERENCED):
Plant fibres are used in materials such as ropes and fabrics and are required to be strong in order to
hold weight and not be ripped. Plant fibres have cell walls containing cellulose microfibrils in a net-
like arrangement. The strength and arrangement of the microfibrils give the plant fibres their
strength. The secondary thickening (extra cell wall and lignin) is an additional factor giving plant
fibres their high tensile strength. Strength can be defined as the maximum stress a material can
withstand without failing (breaking). Tensile strength is the maximum stress caused by a pulling
force that a material can withstand without failing.
METHOD
1. Carry out instructions given (or those you have produced and researched) to complete the
practical (CPAC1)
2. List apparatus below and describe techniques used when measuring quantities with a
particular piece of apparatus:
Piece of apparatus Purpose of piece of Comment on how piece of equipment Appendix
apparatus was used 5c
accurately/appropriately/safely technique
Celery, banana, Plant fibres were taken No risk
wool, cotton, hemp and used as comparisons
twine
Scalpel used to cut sections of do not point towards people as it is
the banana peel and sharp and can cut so handle with care.
celery in order to obtain If cut, apply pressure and cover with
fibre plaster. High risk
A set of weights used to put weights on Weights had to be kept in the middle
(added in the plant fibres to see of the table to ensure they did not fall
increments) and lead to injury. Medium risk
2 clamps used to hang the plant For accuracy, the clamps had to be
fibre so that you can tightened properly to ensure they did
place the weights on the not move. Low risk
fibres
Clamp stands Used to hold the fibres so Had to be kept in the middle of the
that they can pull the table to ensure they did not fall, as
fibres they are heavy. Low risk
Tissue and gloves Used to handle plant No risk
fibres
(CPAC a2a, 2b, 2d, 3a, 3b)
Mr Alim
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