# Light Intensity's Effect on The Rate Of Photosynthesis

Light Intensity?s Effect on The Rate Of PhotosynthesisIntroductionI am aiming to research my theory the when light intensity increaseson a plant, photosynthesis will also increase at a directlyproportional rate, in contrast to the light.Photosynthesis is the operation in which a plant collects sunlight (orany other light) and traps it in chlorophyll, and is used in themanufacture of a carbohydrate from carbon dioxide and water.
This process can be summarized by the equation below: CO2 + H2O → (light energy) → CH2O + O2 Or Carbon Dioxide + Water →(light energy) → Carbohydrate + Oxygen Light is a source of energy. During photosynthesis, the light photochemically splits water. This provides hydrogen atoms for the reduction of carbon dioxide (CO2). [image]# Prediction I predict that the more light intensity that a plant endures, the more photosynthesis will occur. I think this because photosynthesis can increase, and the more light that falls on the plant the more photosynthesis will occur. I also predict that it will do this in a directly proportional rate. I predict when it gets to a certain point; photosynthesis will stop increasing and will be at a constant rate. This is because light is a limiting factor of photosynthesis. Apparatus
Pond Weed (elodea)
Ray box and Power Pack
Beaker (300ml)
Water (300ml)
Thermometer
Funnel
Test Tube
Stopwatch
Volt Metre
Box
Variables
Distance of the plant from the light source (light intensity)
Amount of O2/CO2 present in the air
Temperature
Amount of chlorophyll in plant
Type of plant
Method I will collect all the apparatus I stated earlier, and set it up as shown in this diagram: [image]
I will put the water (300ml) into a 300ml Beaker.
I will let the plant accustom to the light intensity for 2 minutes
from the ray box and then count the amount of bubbles for 3
minutes,
I will do this for a low light intensity and going up to a higher
one. I will control this using my power pack voltage measure. I
will use the voltages as follows:
volts: 3v 4.5v 7v 9.5v 12v Fair Test
Record and Control the temperature
Wash all apparatus when finished
Control Light Intensity
Only let light from ray box onto the plant
Time using an accurate stopwatch
I will not interfere with the experiment while the 3-minute test
is taking place.
Safety
Don?t run
Tell people around me that I am starting the experiment
Wear goggles
Tuck tie or extruding clothing out of precarious situations.