Alevel biology practical write up is a report of a laboratory experiment conducted by students. It is required as part of the assessment for the subject.
The a-level biology practical write up document is a professional report and should be organised in a clear and logical manner. It should inc...
The Strength of Plant fibres
To determine the tensile strength of plant fibres.
Hypothesis:
The longer the plant fibre,the stronger the tensile strength
Tensile strength is the maximum pulling force that can be applied to a tissue before the
tissue breaks. The fibres are made of cellulose, which is a long chain polysaccharides, made
up of beta glucose molecules. Each molecule is inverted and held together by glycosidic
bonds. The fibres in plants are held together by lignin and pectin, which act similar to a glue.
When many of the fibres are held together by this glue they form microfibrils, which are
extracted through the process ‘retting’. To dissolve the glue, plants can either be water retted
or retting flax.This process causes the glue to loosen, allowing the fibres to be extracted.
Equipment :
● 2 clamp stands
● G clamps
● A set of weights
● Retted fibre
● Gloves
● Scalpel
● Goggles
● Tray
Variables:
● Dependent-the amount of mass added
● Independent- length of the fibre used
● Control- size of the weights ,width of the fibre
Risk Assessment;
➔ Probability/severity of risk: 1-Low, 2-Medium, 3-High/Likely
➔ Total Risk: 1, 2,3, 4, 6, 9
Risk Hazard Severity Probability Total Precaution taken
Risk
weight injuries to 1 2 2 Keep weights away from
body table edge
Fibres may 2 2 4 Wear goggles and gloves
irritate to prevent coming in
eyes contact with fibres
sharp injuries to 2 2 4 Handle with care, carry
objects e.g. body safely and securely
scalpel
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller Strvlight. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for £4.39. You're not tied to anything after your purchase.
