Photosynthesis.

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Presentation transcript:

Photosynthesis

Lesson Starter (in your jotter) Write down the equation for photosynthesis What would happen if one of the RAW MATERIALS for photosynthesis wasn’t present? What happens to the OXYGEN which is produced during photosynthesis?

Today we are going to: Discuss what happens to the products of photosynthesis Learn how to test for starch Carry out the “testing for starch” experiment

During photosynthesis.. Plants make OXYGEN and GLUCOSE. Oxygen leaves the cell What does the glucose do?

The plant converts the glucose into the STORAGE molecule called STARCH

Testing for Starch We can test whether a plant has been PHOTOSYNTHESISING by testing for the presence of STARCH We use IODINE to test for starch.

Before we test the leaf.. Plant cells are WATERPROOF and their CELL WALL makes it difficult for the chemical (IODINE) to get through We need to PROCESS the leave before we can do a starch test

EXPERIMENT Boil the leaf in water for two minutes (this kills the cell and softens the cell wall)

EXPERIMENT Make sure the Bunsen burner is turned off- ethanol is extremely flamable Use the heat from the boiling water to heat the leaf in a test tube of ethanol This removes the chlorophyll- you will notice the ethanol turning green

EXPERIMENT The leaf should now be pale in colour Rinse it in the boiling water Spread the leaf on the white tile and add a few drops of iodine to it What do you see happening?

Instructions- work in pairs Set up a tripod stand, Bunsen burner and a beaker filled with 100 mls of water and place the leaf in the water- I will come and light the Bunsen Boil the leaf in the water for 2 minutes TURN THE BUNSEN BURNER OFF Place the leaf in a test tube of ethanol then place the test tube in the beaker of boiling water- you will notice the ethanol starting to go green Take the leaf out of the ethanol and spread it across the white tile Add a few drops of iodine What do you notice?

Iodine In the presence of STARCH, IODINE will turn from yellow/orange to a blue/black colour Iodine remains yellow No Starch present NO PHOTOSYNTHESIS Iodine turns blue/black Starch present PHOTOSYNTHESIS has taken place

Complete page 7 in your photosynthesis booklet

Complete homework task on page 4 for me to collect in and check tomorrow (Tuesday 1st of September)