Presentation on theme: "B2 ISA preparation. Stomatal density in 3 species of plant Mrs S Carpenter."— Presentation transcript:
B2 ISA preparation. Stomatal density in 3 species of plant Mrs S Carpenter
TITLE: Photosynthesis - making the links Objectives: Unit 2 biology - ISA preparation. Stomatal density in 3 species of plant. KEY WORDS: Investigation Accurate Measuring Prediction Control variables Independent and dependent variables Reproducibility Graph Mean Standard deviation Outcomes: Pupils will consider how to prepare slides for the investigation. Pupils will consider how to control the variables for the investigation. Pupils will consider health and safety risks and plant to take reasonable precautions to minimise those risks. Pupils will know the independent and dependent variables. Pupils will consider how to draw up a suitable results table.
Cross section of a leaf
Stomata What are stomata needed for? What controls how they work? What do the terms hydrophyte, mesophyte and xerophyte mean? Why would some species have a greater density of stomata than others?
Experimental design What are you trying to find out? What could your hypothesis be? How do you plan to do this experiment? What are the independent and dependent What do you need to control? What health and safety risks are there?
Produce your own health and safety risk assessment sheet Nature of the hazard What could happen? High, medium or low risk What do you do to ensure the risk does not occur? What do you do if the risk occurs? GlassGet brokenMediumDo not put glass slides on the edge of the table Do not touch it. Tell the teacher who will dispose of it in the glass bin.
Research You need to do reading to be ready for this investigation and to be able to compare other methods/sources. A window on the past: Measuring stomatal density | Nuffield Foundation. This is on the Nuffield foundation website. A window on the past: Measuring stomatal density | Nuffield Foundation Measuring Stomatal Density - Science & Plants for Schools. This is on the SAPS website (science and plants for schools). Measuring Stomatal Density - Science & Plants for Schools You need to read and compare both sources of information and make you own notes on the method and practical consideration for this investigation.