Slide 1

Photosynthesis

Label the diagram:

Carbon DioxideGlucoseOxygenWaterChloroplastRate of PhotosynthesisIB Environmental Systems and Societies Topic 2Internal Assessment

Learning outcomesAll of you should be able to:Identify the abiotic factors that affect photosynthesis.Carry out the pre-lab to calculate the rate of photosynthesis.

Most of you should be able to:Describe photosynthesis in terms of inputs, outputs, processes and energy transformations.

Some of you might be able to:Explain how changing these abiotic factors will affect the rate of photosynthesis.

PhotosynthesisSummarise photosynthesis in terms of the following:

InputsOutputsProcessesTransformations

Inputs

Outputs

ProcessesChlorophyll traps sunlight of different wavelengthsThe energy is used to split water moleculesHydrogen from water is combined with carbon dioxide to produce glucose

TransformationsLight Energy Chemical Energy

Can you write the word equation for photosynthesis?

Inputs of Water, Carbon Dioxide and SunlightLight energy is trapped by the chlorophyll inside the chloroplastsEnergy is released by splitting water into hydrogen and oxygenOxygen is released to the atmosphereThe hydrogen combines with carbon dioxide to make glucose.PhotosynthesisNow your turn!!Lesson 1:Pre-labCarrying out a standardised practical using handouts I will give you.Thinking about how you could adapt the experiment for an Internal Assessment .

Lesson 2:Using your Planning Lab Training Sheet you will work in teams to design a practical investigating the rate of photosynthesis.

Lesson 3 + 4: You will carry out the practical and collect data as a team.

Lesson 5:I will show you how to start processing the data to analyse the rate of photosynthesis. Drawing the graphs needed to process the data.

Lesson 6 We will use Excel to process the data further and create our final graphs.

Lesson : 7We will go through writing a discussion, evaluation and conclusion for this Internal Assessment. Lesson : 8 and 9You will have a double period to finish of the write-up of your internal assessment and ask any final questions you might have.You will finish the rest for homework and bring it to the lesson in one week where you shall self-assess them.

Pre-lab

Cut 10 leaf discs and remove the plunger from the syringe.Place the leaf discs into the syringe.Holding a finger over the syringe-opening, draw back on the plunger to create a vacuum. Let off vacuum.You will probably have to repeat this procedure 2-3 times in order to get the disks to sink.Pour the discs and solution into the beaker. 11Pre-Lab