• 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

# Investigation into one of the factors that affects photosynthesis

Extracts from this document...

Introduction

Investigation into one of the factors that affects photosynthesis Plan The aim of this activity is to investigate one of the factors that affect the rate of photosynthesis in pond-weed. I am trying to find out if the distance of the pond-weed from a lamp will change the rate of photosynthesis. I will measure the rate of photosynthesis by counting the number of bubbles that are released by the stem of the pond-weed when the lamp is shone on it from different distances. What I think will happen is as the pond weed is moved further away from the lamp, less bubbles will be produced. I think this will happen because the light intensity will be less on the pond-weed as it gets further from the lamp therefore the rate of photosynthesis will not be as high. The word equation for photosynthesis is: Carbon Dioxide + Water = Glucose + Oxygen + Energy Pond-weed is being used fro this experiment because with a normal plant that does not live ...read more.

Middle

-For each reading make sure the temperature of the water is the same as when you started the experiment. -Carry out this procedure 3 times with each of your chosen different distances and record the results. Before I begin my experiment I am going to take preliminary results to practice this method before I start. Preliminary results Ammount of bubbles produced per 30 seconds Distance from light 1st attempt 2nd attempt 3rd attempt Average 10cm 63 65 60 62.7 20cm 17 14 16 15.7 30cm 9 11 10 10 40cm 3 5 5 4.3 50cm 3 3 3 3 60cm 2 3 3 2.7 70cm 2 2 2 2 80cm 1 1 2 1.3 90cm 0 0 0 0 100cm 0 0 0 0 These preliminary readings fitted what I expected so I am not going to change my experiment. Observations Ammount of bubbles produced per 30 seconds Distance from light 1st attempt 2nd attempt 3rd attempt Average 10cm 67 46 61 58 20cm 40 14 18 24 30cm 10 ...read more.

Conclusion

In other words, the rate of photosynthesis decreased as the light intensity was less. Evaluation If I repeated my experiment I could change it by taking more readings for each distance to make my results and average more reliable. I could also change it seeing if my results change much if a bigger piece of Elodea is used for the experiment. My experiment because I experimented the variable I chose to investigate thoroughly, I used 10 different distaces and tested each one three times to gain an accurate set of results. My experiment was nreliable because for each reading the temperature of the water was not exactly the same so this would have affected the rate of photosynthesis and affected my results. My experiment was also unreliable because the distances I measured from the lamp may not have been exact so this may have not made my results precise. Overall I think my experiment was successful because I found out what it was that I wanted to find out, how does light intensity affect the rate of photosynthesis. Alex Arkley 10.M2 ...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. ## Experiment to Investigate the Effect of Temperature on the Rate of Photosynthesis in Elodea.

Another problem with the experiment could have been the Elodea being forced to photosynthesise too much. This could have damaged the plant, more likely at the higher temperatures, and therefore subsequent readings may not demonstrate a true pattern of the rate of photosynthesis at different temperatures.

2. ## This experiment involves using a photosynthometer to investigate how temperature affects the rate of ...

This may well be to the fact that the temperature was not controlled as intended, and possibly exceeded 45o C, thus causing the enzyme to denature. Hence a decrease in photosynthesis is observed. When the elodea specimen is placed in water at room temperature, the number of bubbles observed are more or less the same.

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

So in the actual experiment the elodea can be let to acclimatise in the test tube still using water from the same source. But this can be time consuming. So the elodea to be used can already be kept overnight in water, and the same water in which the elodea

2. ## Investigation To Find The Effect Of Temperature On The Rate Of Photosynthesis Of Elodea.

The only problem of this experiment is that there is no way to define or "measure" the color of light. Wave length would be a solution but this cannot be measured with available equipment. We only have a general idea of how to class colors.

1. ## What affects the rate of photosynthesis in Elodea?

have no idea yet how any bubbles or how fast the bubbles will be coming but I expect that a tally chart will be okay to measure fast coming bubbles as well as slow coming ones. Preliminary experiment: A preliminary experiment is one or two experiments where you test your method and see if there is anything that needs improving.

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

These plants include grasses such as Fescue and plants, which have minimal leaf surface areas such as Ladies Bedstraw. The driest areas are hypothesised to be at the top of the pingo. Rosette plants such as plantains will be present where there is a high light intensity and sufficient space

1. ## Investigate the factors, which affect photosynthesis.

Fair test In order for the experiment to be a fair test and the results to be accurate as possible, it is convenient to do the following points: * The conical flasks should be airtight. * When the starch test will be taken under consideration, the same amount of iodine should be used to test both leaves.

2. ## INVESTIGATING HOW TEMPERATURE AFFECTS THE

For example the type of the beetroot should be the same; if not then this could affect what temperatures the membrane denatures because of the different prior environments of the beetroot. I will make sure that I wipe the test tubes after rinsing them so any excess water is removed.

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