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Canadian Pondweed

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Sc1 Investigation By Jason Shelton AIM I am to plan an investigation to examine the factors which increase or decrease bubble production in a canadian pondweed. FACTORS Factors that i think will affect the investigation will be: Light Concentration of the potassium hydrogencarbonate Temperature Stomata 1) The reason that the amount of light will affect the investigation is because in the dark a plant cannot Photosynthesiseat all. In dim light it can photosynthesise slowly. As light intensity increases, the rate of photosynthesis will increase, until the plant is photosynthesising as fast as it can. At this point it would not matter whether you increased light. A - B Light limiting factor, the plant is limited in how fast that it photosynthesise. Between B - C the light is not a limiting factor because the plant is workinbg at its full photosynthesising rate. You show this because even when the light intensity is increased it has no effect what so ever on the rate of photosynthesis 2) ...read more.


4) The carbon dioxide that the plant uses passes into the leaf through the stomata and if they were closed then photosynthesis can not take place. So therefore on warmer days the stomata often close to prevent too much water being lost and then the less carbon dioxide the plant can take in. THE INFORMATION THAT I HAVE FOUND HAS BEEN FROM A GCSE BOOK ON BIOLOGY I have chosen to change the concentration of the potassium hydrogencarbonate because i think that the amount of carbon dioxide will be an interesting investigation because i will be able to find out whether or not teh amount of carbon dioxide can decrease the amont of bubbles or whether it can increase ut. I have reasearched it and so far i am expecting to see an increase as the concentration rises. It should go steady and then no more increasing or decreasing of the rate. I am hoping to do 0.5% 1% 1.5% 2% Each experiment will consist of 3 experiments so then i will be able to get a mean and that will mean that i will be able to get it as accurate as i can. ...read more.


The time of day is a hard one to change and i dont think that we will be able to do that so we will just have to try and get the lessons in order and then do it at similar times, give or take an hour or two. Another thing is the amount of bubbles will be counted manually so there might be some trouble there so it would be a good idea if we had the same person counting because some bubbles might be seen by one person and not the other and also one person might call one a bubble and the other might not. APPARATUS RISK This is a science lab that we are working in and normal rules apply. The hair must be tied back and also we will be using glass in the equipment so danger there too. METHOD The apparatus will be used in the same manner all the time so then we will try and get an accurate reading of bubbles. STEP BY STEP 1. apparatus together.( set out like below.) 2. Get the temperature right level so then it will make it fair. ----------+ ...read more.

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