• Join over 1.2 million students every month
• Accelerate your learning by 29%
• Unlimited access from just £6.99 per month
Page
1. 1
1
2. 2
2
3. 3
3
4. 4
4
5. 5
5
6. 6
6

# The rate of photosynthesis will increase as the light intensity increases.

Extracts from this document...

Introduction

Photosynthesis AT1 Prediction The rate of photosynthesis will increase as the light intensity increases. Method Make the room dark as possible so light from windows do not influences the results Cut a piece of weed 10cm long Attach it to a paper clip at the uncut end so the weed is weighed down. Put into a beaker of water which so at a higher level than the weed. As shown in diagram Illuminate weed with a lamp from a distance of 1.60 meters and also place a heat shield between the lamp and baker. Count the number of bubbles given off during a period of 1min record results , and restart the experiment with the a different piece of weed 3 time . Carry put the same experiment at different length as stated below: 1.40m, 1.20m, 1.00m, 0.80m, 0.60m, 0.40m, 0.20m Results: Distance from weed in meters Attempt 1 Attempt 2 Attempt 3 Average 1.60 22 26 24 24 1.40 40 39 38 39 1.20 56 50 50 52 1.00 64 62 60 62 0.80 85 83 84 84 0.60 82 83 84 83 0.40 51 81 84 72 0.20 83 81 85 83 Conclusion I have found that as the lamp was brought closer to the pond weed the bubbles were being produced more often, and the amount of bubble produced increased. ...read more.

Middle

The best example of light energy is when it is transferred into electrical energy in solar cells. Plants have been using light energy for the photosynthesis. The products need in photosynthesis is: Carbon Dioxide and Water. The word equation for the reaction is: Carbon Dioxide + Water --> Glucose + Oxygen In plant glucose is need as food and oxygen is simple a product that isn't needed and the plant release the oxygen into the atmosphere by diffusion , this is why the bubble are produce and this is also the very reason why counting the number of bubble tell us how fast the reaction is taking place. Because light energy is needed the more light intensity the grater the rate of reaction and the faster the bubbles are produced. Until the other variables we are changing will have no other effect because of these limiting factors. These limiting factors could be: Temperature Level of CO2 And of course the light intensity; If u look at the sketch of graph of altering these variables you will see that at first there is a steady increase in the rate of photosynthesis but then the rate decreases and stabilizes, the reason why it stables is because of the other limiting factors. ...read more.

Conclusion

Here is a diagram of how I would setup the experiment: by doing the experiment this was I would be able to get more accurate results, and also prove if there was any doubt that the bubble are oxygen bubbles, using the collected, gas in the syringe, and putting a glowing splint into it, obviously if it the splint re lit its self I would know that the gas a oxygen. If I was to extent this investigation I would try to see how other variable can affect the rate of the bubbles being produces: For example, if I wanted the see how carbon dioxide concentration affected the rate of photosynthesis then I would use different concentration of carbonated water and look for any changes. Also another variable I could investigate would be the temperature of the water in which I place the pond weed and chance the temperatures to find an optimum temperature; I and I would predict for such a experiment that above a certain temperature photosynthesis would stop because the plant cells would die. Sources for information and Application used : CGP revision guides ( chemistry & Biology) Lansdale Science Revision Guide ( Vol 1,2) MS WORD MS EXCELL MS PAINT ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our GCSE Green Plants as Organisms section.

## Found what you're looking for?

• Start learning 29% faster today
• 150,000+ documents available
• Just £6.99 a month

Not the one? Search for your essay title...
• Join over 1.2 million students every month
• Accelerate your learning by 29%
• Unlimited access from just £6.99 per month

# Related GCSE Green Plants as Organisms essays

1. ## Investigation to find out how light intensity effects the rate of photosynthesis

4 star(s)

take place, there may not be enough carbon dioxide or even too much. Whatever the reason the main conclusion for normal results is dependent on the light intensity. Evaluation Overall, I would state the experiment as a success since my predictions were supported by my results.

2. ## Confirm which factors increases or decreases the rate of photosynthesis.

Since it is easier to test for starch that for sugar, we regard the production of starch in a leaf as evidence that photosynthesis has taken place. In all the experiments described are designed to see if the leaf can make starch without chlorophyll, sunlight or carbon dioxide, in turns.

1. ## Investigating the effect of temperature on the rate of photosynthesis

This is because the top of it had to attach to the tube. This means that not all the oxygen bubbles released could be counted, as it would be released into the atmosphere rather than the water. Significant Limitation: The most significant limitation is that we cannot fully associate the

2. ## How temperature affects the rate of photosynthesis.

But it wasn't predicted that the rise in the rate of photosynthesis from 0 oC to 15 oC would be less steep than the rise between 15 oC -25 oC and 25 oC -35 oC. Also as predicted at 0 oC the elodea showed the lowest rate of oxygen production

1. ## An Investigation into Species Diversity with distance along a Pingo.

Look out for natural hazards. Be alert at all times Slipping on steep slopes Wipe clean any injuries and use a sterile plaster on any cuts or grazing Tread carefully, where possible sit or kneel down to collect data as opposed to standing/bending over. This will reduce the risk of slippage and wont strain the back.

2. ## Research the theory that when light intensity increases on a plant, photosynthesis will also ...

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.

1. ## Photosynthesis - revision notes

(2) Do plants need chlorophyll to make starch?? It's impossible to remove chlorophyll from a leaf without killing it!!!! So we have to use a plant that has variegated leaves. ==> These are plants which have parts that are green (contain chlorophyll) and parts that aren't (don't contain chlorophyll).

2. ## Investigate the effect of light intensity on the rate of photosynthesis in an aquatic ...

Should the 2 results gained be totally different, I will then proceed to take a 2nd repeat. The outcome variable I will be measuring is the amount of oxygen produced by the aquatic plant known as pond weed. Oxygen is one of 2 products of the green-plant process photosynthesis, the other being glucose.

• Over 160,000 pieces
of student written work
• Annotated by
experienced teachers
• Ideas and feedback to