• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

Investigating the factors that will affect the rate of photosynthesis.

Extracts from this document...

Introduction

Investigating the factors that will affect the rate of photosynthesis Aim: I will be investigating how light intensity affects the rate of photosynthesis, whether it decreases or increases the rate of photosynthesis. Background Knowledge: Photosynthesis is the process by which plants make their own food. For photosynthesis to occur, plants need: * Light energy from the sun * Chlorophyll to absorb light energy * Carbon dioxide from the atmosphere and from respiration in plant cells * Water which is absorbed by the roots and transported to the leaves by the xylem tubes. Photosynthesis can be summarised by the equation: 6CO2 + 6H2O C6H12O6 + 6O2 The reactants are Carbon dioxide and Water; the products are Glucose and Oxygen. The factors that affect the rate of photosynthesis are: * Light intensity- if the light is brighter, then the rate of photosynthesis increases and visa versa. * Water supply- if a plant cannot absorb enough water, then the rate of photosynthesis decreases. * Carbon dioxide concentration- if the percentage of carbon dioxide in the atmosphere increases, so does the rate of photosynthesis. * Temperature- if the temperature increases, then the rate of photosynthesis also increases, (however, temperatures above 40OC can damage a plant and photosynthesis stops because the chlorophyll gets too hot). ...read more.

Middle

8. Boiling tube- This is where I will put the Elodea plant along with some water, so photosynthesis will take place. 9. I will use this because it is one of the reactants of photosynthesis. The measurements I will be taking are: * The amount of water in the boiling tube, in millimetres. * The distance between the Elodea and the lamp, in centimetres (10cm-60cm). * The number of oxygen bubbles produced. * The minutes of each interval for every minute, to about 5-8 minutes. Safety: 1. Do not touch the light bulb as it will be very hot. 2. Keep the lamp and boiling tube away from the edge of the table so it does not fall as smash. 3. Tie back long hair and secure loose jewellery and items of clothing. 4. Do not touch the power supply with wet hands and make sure water is not poured near the power supply. 5. When pouring water, pour it in the sink. 6. Keep eyes on experiment at all times. Method: 1. Set up apparatus as shown below. 2. Measure 10cm between the boiling tube containing the Elodea plant and the lamp. 3. Switch on the lamp and start the stop watch. 4. ...read more.

Conclusion

Evaluation: My method worked very well; there were no results which contradict my background knowledge or prediction. My step-by-step guide was very helpful and my evidence obtaining procedure work well. The quality of my result was quite high because I only had 2 anomalous results which's percentage of errors were not too great but 1 was over 10% and may be considered invalid but apart fro this most of my results are valid. My procedure was very suitable because it did not cause any mistakes which could have caused shock and unexpected results, so it is very suitable. To improve my work I could have repeated the experiment another 4 or 5 times to solidly confirm my conclusion and I could have do my experiments in a close area, where the temperature and carbon dioxide were 100% constant and therefore would not affect my results the slightest bit. Percentage of error= error/what it should be *100 = 0.3/4.2 * 100 = 7.1% This error is not over 10% and is insignificant, my result is therefore still valid. Percentage of error=error/what it should be *100 =0.25/1.25 *100 =20% This percentage is over 10% and can be considered invalid and is probably due to human error such as miscounting of the number of oxygen bubbles. ...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

See related essaysSee related essays

Related GCSE Green Plants as Organisms essays

  1. Confirm which factors increases or decreases the rate of photosynthesis.

    If the photosynthesis story is sound, then the lack of any one of these three conditions should stop photosynthesis, and so stop the production of starch. In designing the experiments, it is very important to make sure that only one independent variable is altered.

  2. Experiment to Investigate the Effect of Temperature on the Rate of Photosynthesis in Elodea.

    The results were as follows: Table 1: Table to Show Rate of Production of Oxygen at Different Light Intensities Lamp distance from elodea (cm) Number of bubbles 5 84 10 68 15 56 20 40 25 32 30 24 Here is a small graph of the results above: This graph

  1. The aim of this experiment is to investigate the factors affecting photosynthesis in Elodea.

    If I then move the elodea further from the lamp, by the same distance as previously, the number of bubbles released per minute will once again halve.

  2. How temperature affects the rate of photosynthesis.

    Different substrate molecules called inhibitors have shapes similar to the active site of the enzyme molecules and can block the active site, thereby making the enzyme ineffective. All these factors including temperature have an impact on how the enzymes work and therefore the rate of the reactions controlled by the enzyme.

  1. Investigating the abiotic factors that affect the size of Ivy leaves in shaded and ...

    pH Test Fill 1 of test tubes with day soil to 1ml mark. Add 1 spoon of barium sulphate then add the pH test solution to the 2.5ml mark. Cap the test tube and shake-leave to settle for 10mins. If the solution is taking too long to settle, add another spoon of barium sulphate and re-shake.

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

    The readings at 0 cm and 5 cm were repeated many times until the rate of photosynthesis had begun to settle. From then on, there were no more similar problems during the experiment. To make sure that the there The negative effects from this problem may be inaccurate data for some readings.

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

    The optimum temperature of rubisco is 45o C. Exceeding this temperature causes the bonds that hold the polypeptides in specific shapes to be broken and thus the active site changes shape3. The substrate (.i.e. Ribulose Bisphosphate) is unable to fit into the active site and therefore no photosynthesis occurs.

  2. Limiting Factors & the Rate of Photosynthesis.

    Increasing temperature increases the rate of reactions. After their optimum temperature the enzymes denature and the rate slows down. Interaction of Factors Controlling Photosynthesis As from the above graphs, they show that the rate of photosynthesis is determined at different intensities.

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