⇨What are you trying to investigate?
The aim of this experiment is to determine if the intensity of light changes the rate of photosynthesis in a pondweed. To do this experiment I will put a piece of pondweed torn into two pieces in different light intensities. I will measure how much oxygen is released by counting how many bubbles float up.
Prediction & Hypothesis
⇨What do you think the result will be?
I predict that if the light intensity increased photosynthesis will be faster. I think that the temperature will also effect the rate of photosynthesis, for example if the lamp which is the light source I am using is too close to the pondweed the water could get warmer. This means that when the lamp is closer to the pondweed, the light intensity would be higher. I also think that if more baking powder is added this will increase the carbon dioxide concentration.
⇨Explain why you think this?
I think this because for the rate of photosynthesis to increase ideal light, temperatures and carbon dioxide are needed. When the light source is moved closer to the pondweed more of the plants surface will be in contact with the light, therefore more photosynthesis will occur, leading to more oxygen and glucose.
⇨Use scientific ideas and words.
⇨Include chemical formulae, diagrams and sketch graphs if you can.
⇨List the things you will use.
A strand of Pondweed
A drop of detergent (optional)
Water (enough to fill a beaker and test tube fully)
⇨Specify size and type of apparatus if you need to.
⇨Suggest two safety precautions.
Two safety precautions you need to be aware of are; handle the glass funnel, test tube and beaker with caution, because they are all breakable. Another precaution is to remember not to allow the lamp to come in contact with water.
⇨What you will measure, how and in what units?