Snab biology coursework

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Snab biology coursework

Wear rubber gloves when immersing them to avoid stings. Retting plant material smells strongly! Consider where to set it up.

New Print Informática - (81) ou Introduction An enzyme is a protein with a special shape, which catalyses or speeds up chemical reactions inside our bodies.
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Removing the leaves and flowers reduces the smell as they make a slimy mass when they rot. After soaking for a week exact time depends on temperature and may take longer in cooler weather all the soft tissue, both outside and inside the vascular bundles will wash away in running water.

Snab biology coursework ring of vascular bundles may need to be opened to wash out the pith within. Celery vascular bundles are easy to extract and test and do not need retting. New Zealand flax Phormium is also suggested for this procedure. Ethical issues There are no ethical issues associated with this procedure.

Wear eye protection and gauntlet gloves when harvesting nettles. Set out shallow boxes with crumpled paper for masses to fall into: Preparation a Remove the leaves and flowers from stems of mature stinging nettles.

Leave them soaking for at least a week. Investigation a Remove the stems from the water. The outside cuticle and epidermal layer will rub away and the central pith will be left when you peel away the fibres.

These fibres are made up of vascular tissue; they contain both the xylem vessels and sclerenchyma fibres.

Teaching notes The aim of this practical is for students to design and carry out an experiment to test the strength of extracted fibres. This can be a very straightforward experiment — many biomechanical experiments are.

Snab biology coursework

The aim is to get students thinking carefully about planning — to highlight experimental skills and practise for advanced level coursework investigations.

Retting is very smelly. Students could extract the fibres themselves, or it could be done for them in advance. Producing good results is fiddly and requires a certain skill.

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Suggested methods Refer to the SAPS newsletter Osmosis 22 — see link below — for details and diagrams of ideas on testing strain and stiffness of plant material. Apply a force in the centre using suspended masses or a force meter.

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