This list is by no means complete or exhaustive. Chase Organizer in press forApril. Discovery-based STEM learning 2. Are we there yet?
Wear rubber gloves when immersing them to avoid stings. Retting plant material smells Biology coursework osmosis investigation Consider where to set it up. 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. The 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. 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. 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. The mass or force required to break the fibres gives a measure of tensile strength.
With fine fibres this will need very small masses — perhaps single paperclips or shorter lengths of wire. Support them horizontally at a fixed point on their length. Measure the distance of the free end of the fibre from a mark at the same horizontal level as the supported end.BIOLOGY COURSEWORK: How the Concentration of Sucrose affects Osmosis in plant cells AIM: To investigate how changing the concentration of sucrose can affect the osmosis in plant cells RESEARCH Definition of Osmosis: Osmosis is the movement of water molecules from an area of high water concentration (weak solution) to an area of .
Ccea as Biology Coursework: an Investigation to Find the Water Potential of Potato and Carrot Tubers in a Sucrose Solution over a 24 Hour Period and the smaller the mass gets.
Osmosis is the movement of water from a high water potential to a low water potential across a semi-permeable membrane. Extracts from this document Introduction.
Biology Coursework Beetroot Hypothesis: To investigate the effect of different concentrations of ethanol on the permeability of beetroot cell membranes. Biology Coursework: Osmosis in Potato Cells Introduction We are going to investigate the process of osmosis in potato cells.
Enjoy proficient essay writing and Potato And Osmosis Investigation CourseworkInvestigate Osmosis:: GCSE Biology Osmosis Coursework Investigate Osmosis Aim:To investigate osmosis.
Conclusion. Getting the right ratio of distilled water and sucrose solution was very difficult. This is because measuring cylinder scales were very narrow and getting the right ratio was hard.
- Investigate the Rate of Osmosis in Different Vegetables (Carrot, Potato, Swede, Parsnip and Sweet Potato) In this coursework experiment I plan to find the rate of osmosis in different vegetables (Carrot, Potato, Swede, Parsnip and Sweet Potato).