The Effect of Light Intensity on Photosynthesis Of Elodea Canadensis

The Effect of Light Intensity on Photosynthesis Of Elodea Canadensis

Introduction

I wanted to find out how much the light intensity affected the

Photosynthesis in Elodea Camadensa. I decided to do this by measuring

the amount of oxygen created during photosynthesis.

Photosynthesis is the procedure all plants go through to make food.

This process uses Carbon dioxide, water and light energy. It produces

Oxygen and Glucose.

[IMAGE]Carbon dioxide + water Light Energy glucose + oxygen

Chlorophyll

[IMAGE]6CO2 + 6H20 Light Energy C6 H12 O6 + 6O 2

Chlorophyll

Photosynthesis occurs in the leaves of the plant in the palisade

layer. Chlorophyll in the cells in the palisade layer absorb light for

photosynthesis. The plant releases the oxygen created in

photosynthesis back into the air but it uses or stores the glucose for

energy, respiration, growth and repair.

The leaves and plants are also specially adapted for photosynthesis in

their structure and cell alignment.

Preliminary Experiment

Apparatus

* Piece of Elodea Canadensis

* Bulb

* Voltmeter

* Test tube

* Beaker

* Box

* Two electrical wires

* Stopwatch

* Thermometer

Method

I put a piece of Elodea Canadensis (pond weed) in a test tube and

covered it with water.

The test tube was then placed in a beaker with a thermometer so that

the water stayed the same temperature, this was then placed in a

cardboard box with a bulb attached to a voltmeter by the electrical

wires so that I could concentrate how much light the plant got.

I varied the voltage (intensity) of the bulb and counted how many

bubbles of oxygen were created at each voltage in one minute.

I tested each voltage three times for accuracy for a minute each time.

Results

Preliminary Experiment

Amount of bubbles

Light intensity (lux)