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Task 06 - Deconstruction and design - effect of salt on weeds.docx

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Stage 2 Biology: Investigation Folio Task Topic 2: Cells as the Basis of LifeDeconstruct and Design Task: Effect of salt on weedsIntroduction and Purpose of Task:Diffusion is a passive transport process that enables substances to move with the concentration gradient across membranes in cells. Osmosis, a specific type of diffusion, transports water from regions with a low solute concentration to high solute concentration. Diffusion and osmosis play important roles in maintaining the intracellular environment.Consumers are looking for more environmentally friendly options for combating weeds in the garden. Many claim that using salt is a good alternative to synthetic weed killers that are known to be detrimental to the environment and human health. However, salt can also be detrimental to soil and water quality and also has some environmental impact.Your task is to determine experimentally the lowest concentration of salt that can be used to effectively kill weeds.To deconstruct this problem, you may need to consider the various aspects of this question including (but not limited to): type of weeds, type of salt, salt concentration range, variables, potential limitations, and applications. After the experiment has been completed, you will need to justify your conclusions based on the data obtained. You will also need to consider the limitations of the experiment and consider ways of improving the outcome of your experiment.Part A: Research, Deconstruct the problem and Design your own experiment1.Research: Use several sources to research the effect of salt on plants (weeds), the environment, and other relevant considerations. Keep a list of references used.2.Deconstruct the problem:Brainstorm the various aspects of the question: What is the lowest concentration of salt that can be used to effectively kill weeds?A table may be an appropriate way to organise your thinking and ideas. An example is provided below; however, various formats could be used. The ideas in the table are starting points only.Note for Teachers:Please note that the table that follows has been partially filled in with some of the aspects of thequestion provided for you, the teacher, to assist with how you might discuss deconstructing the question with your students. However, it would notbe appropriate to givethese questions/suggestions to the students. They should explore the problem and develop their own ideas about the factors that could be considered.Ref: A736914, 1.01 of 5Last Updated: 13/06/2018Assessment Type and Task clearly identified.Purpose provides guidance and provides a problem to deconstruct which leads to the design of a method.
FactorsAspects of the Questiontype of weedstype of saltsaltconcentrationrangeMethod optionsOptionsE.g. Common salt% or mg/L Seedlings?

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Term
Spring
Professor
jane oleria

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