Biology Practical

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INTRODUCTION

Plants produce sugar during photosynthesis.

Carbon dioxide + water + energy = Glucose + Oxygen

CO2 from air H2O energy in sunlight C6H1206 used in plant cells Released to air

Plants convert the sugar into insoluble starch to store it.

The Aim of this experiment therefore, was to test a leaf for starch, to see if the leaf has been carrying out photosynthesis.

The test which would be used would be the iodine test for starch(also known as the "biuret test"). The iodine test for starch will turn the solution blue-black on any area or patches on the leaf where there is starch is present.
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APPARATUS

For this experiment the following apparatus were required:

Apparatus

Reason

Leaf/Leaves

To test for starch.

Beaker

To store hot water with leaf.

Thermometer

To measure until boiling point

Boiling tube/test tube

For leaf to be stored with ethanol

Ethanol

to dissovle chlorophyll

Bunsen Burner

to heat water

Water heating basin

to store ethanol in leaf.

Also, as a safety precaution:

Safety goggles, lab coats, tongs and heat proof gloves were being used in order to prevent any harmful ...

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