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

An Investigation to Determine the Effect of the Amount of Light Available on Rate of Photosynthesis in Pondweed.

Extracts from this document...

Introduction

An Investigation to Determine the Effect of the Amount of Light Available on Rate of Photosynthesis in Pondweed Aim To determine to what extent the amount of light available to pondweed affects the rate of photosynthesis. Prediction I predict that as the amount of light increases the rate of photosynthesis will increase, however, above a certain level of light, other limiting factors such as heat, carbon dioxide and available nutrients will stop photosynthesis occurring any faster, and unless these other factors are made more available, increase in light will make no difference. If light is decreased from a natural level, photosynthesis would slow and eventually stop because the equation for photosynthesis is not complete without any energy from light. Equipment Measuring Cylinder Water Pondweed Funnel Beaker Lamp Diagram Plan Firstly, a beaker will be taken and filled with water as close to room temperature as possible, to prevent the temperature from changing during the experiment, then a 5cm piece of pondweed will be laid at the bottom of the beaker. ...read more.

Middle

The pondweed should also not be allowed to move during the experiment or changing of equipment at all, because if it drifts or rotates, a different surface are could be exposed to the light, affecting the result. Each test should be timed and last for 10 minutes, at the end of the 10 minutes the volume of oxygen is measured using the reading on the measuring cylinder and recorded. Fair Test All of the possible variables in the experiment will be kept constant apart from the distance of the beaker from the light which we are testing, in this way test conditions will remain the same throughout the experiment. Variables Unfortunately there will be several unavoidable variables in the experiment beyond our control, but they should not make a significant impact on the experiment's results, these include the ambient light within the classroom changing as time goes by, and the room temperature of the classroom may change slightly. Other than those, the following variables are controlled and kept constant, apart from distance of lamp. ...read more.

Conclusion

Distance of the light from the beaker Control (No lamp) 50cm 40cm 30cm 20cm 10cm Number of bubbles given off Results These were the results gathered from the experiment These results are also shown on a separate graph Analysis / Conclusion The experiment showed my prediction to be correct, however it did not show my predicted stop of light making any effect on the speed of photosynthesis, this may be because the light was never intense enough to prevent it being a limiting factor during the experiment. The graph shows a steady increase in rate of photosynthesis, according to oxygen given off, as the light is brought closer to the beaker, and therefore a positive correlation between the rate of photosynthesis and the intensity of light absorbed by the plant, and ultimately that light is a limiting factor in photosynthesis. The conclusion can also be drawn that as, during the control, no bubbles were given off and therefore photosynthesis was taking place either very slowly or not at all, it is reasonable to assume then that with no light at all present, photosynthesis could not occur, despite heat and carbon dioxide being available. ...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. Marked by a teacher

    AN INVESTIGATION OF THE DIFFERENT SPECIES OF MAYFLY WITHIN THE POOL & RIFFLE

    4 star(s)

    I had to use the Braystoke flow meter to measure the velocity. To do it I had to make the flow meter face the mouth of the riffle. I had to measure the velocity for one minute. Then I had to record the reading on my recording sheet.

  2. Marked by a teacher

    An investigation into the effect of a germination inhibitor on the germination of seeds.

    3 star(s)

    Seeing as the pots have been watered once already, this experiment should be done in the morning so that the next afternoon watering can be done. It will be helpful to note down the times of when you water the plants so you can then use the same time to water them on the other days.

  1. How temperature affects the rate of photosynthesis.

    These are the two most important reactions as they produce the products of photosynthesis- oxygen and glucose respectively. Photolysis of water is an enzyme controlled reaction and takes place in the light dependant stage. The dark stage is controlled by Ribulose Bisphosphate carboxylase (Rubisco)

  2. Investigating the effect of temperature on the rate of photosynthesis

    Make sure the elodea is at the top of the test tube and place it upside down in the beaker of water, keeping the test tube filled with as much water as possible. Water level must be higher than elodea in order to count carbon dioxide bubbles.

  1. The aim of my investigation was to determine how limiting factors would affect the ...

    Just as in other plants. But copper beach trees and red seaweed also contain other pigments which absorb green light and reflect red light. The mixture of green light from the chlorophyll, and red light from these other pigments, looks to us like a reddish brown color.

  2. Find out how the amount of light, that is light intensity, affects the rate ...

    make sure the distance from the lamp and beaker is constant for each try. I will make sure the light intensity is accurate and will not limit carbon dioxide or temperature. I will making sure the pondweed gets enough carbon dioxide by adding sodium hydrogencarbonate and make sure my results are reliable by doing 3 try's.

  1. The aim of our investigation is to find out how the amount of light, ...

    Temperature- the optimum temperature is around 30 . Photosynthesis still works fine up to about 40 . But once you get much above 40 it slows down dramatically. Carbon dioxide- if paraffin is burnt in a greenhouse the carbon dioxide levels increase and so does the rate of photosynthesis- that increases growth.

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

    The root hair is 'very thin extension of the cells that make up the outer layer or epidermis of a root' (Cambridge, Biology 1). They increase the surface area of the root with the soil, so more water can be taken into the plant by osmosis.

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