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

Biology Lab Report. Does light intensity affect the rate of photosynthesis?

Extracts from this document...

Introduction

Title To investigate the effect of light intensity on the rate of photosynthesis Research question: Does light intensity affect the rate of photosynthesis? Hypothesis: Theoretically plants need light to undergo photosynthesis. At low light intensities, there is a shortage of the product of the light-dependent reactions. There fore if the light intensity is low, the rate of reaction will also be low. The hypothesis is that the rate of photosynthesis increases with the increasing light intensity and decrease with the decreasing light intensity. Variables: Independent : distance between the source of light and the pond weed Dependent : time taken for the color of sodium bicarbonate solution to turn from deep red to purple Constant : the apparatus settings, the volume of sodium bicarbonate Solution (5 cc), the length of pond weed (5 cm) ...read more.

Middle

2 G 70 0 Data Processing Rate of photosynthesis can be calculated using formula as below: Number of bubbles released 20 minutes test tube distance from light source, cm rate of photosynthesis, no of bubble/ min A 10 4.5 B 20 1.9 C 30 1.1 D 40 0.8 E 50 0.3 F 60 0.1 G 70 0 Using the information from the table above, we can plot a graph of rate of photosynthesis against light. (see attachment) Conclusion The rate of photosynthesis is directly proportional to light intensity Evaluation: From doing this experiment, some flaws that have altered the experiments result has been detected. 1. The length of the pondweed is insufficient. ...read more.

Conclusion

The amount of oxygen released will alternately increased therefore the experiments results will be much faster and the data can be taken in time 2. The time for doing the experiment should be increased so that there is enough time for the weed to released enough oxygen that will turn the indicator from deep red to purple. 3. The volume of the indicator should be decreased so that the colour changes of the indicator will be faster. The concentration of the indicator should also be reduced so that the colour changes would be faster due to the fact that the mole of the indicator is lesser than usual 4. The experiment should be done in a very dark place where there are no source of light because the present of other light source will alter the experiment's results ...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

Here's what a teacher thought of this essay

4 star(s)

The experimenter gave sufficient detail on how they would investigate the effect of light intensity on the rate of photosynthesis. How variables were to be controlled or manipulated was described, however, the need to control temperature was left out. It might also be important to identify safety issues that might be taken into consideration. Rating ****

Marked by teacher Agnes Mupandiraa 01/12/2012

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

    Biology lab - transpiration

    5 star(s)

    Petroleum jelly was immediately placed around the tube edging to form an airtight seal around the stem. The tubing was bent into a "U" shape and two clamps were used on the ring stand to hold the potometer in place.

  2. Marked by a teacher

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

    4 star(s)

    If you test a leaf for starch during photosynthesis, you find quite a lot. But at night, when photosynthesis stops because there is no light, the starch is changed back into sugar and removed from the leaf through the veins either to a growing part of the plant or to a more permanent storage place.

  1. Marked by a teacher

    transpiration lab

    3 star(s)

    Record your observations in a table which you are supposed to construct to note the observations. Step 7: Weigh the leaves again and record the readings. Results: INITIAL MASS MASS AFTER VASELINE MASS AFTER THE EXPERIMENT CHANGE IN MASS (%)

  2. Peer reviewed

    An Investigation into the Effects that Different Light Intensities have on the Speed of ...

    5 star(s)

    Place these in the long-term culture container. After collecting the woodlice, set up the apparatus as shown above. Suspend the projector so that the first distance of 10cm is obtained. Then extract 10 woodlice from the long-term culture container and place them in the container that has wet cotton wool in it.

  1. Mung bean lab report - examining the effect of light on growth.

    Data: My Data: Plant # Height (cm) 1 12 2 5.7 3 11.3 4 11.9 5 9.8 6 7.9 7 12.1 8 3.8 9 10.5 10 8 Average: 9.3 Class Data: Height (cm) Light Dark 8.3 9.3 8.6 8.5 2 1.2 8.4 10.5 6.3 2.1 7.4 10.5 8 21.3 6.9

  2. How does light intensity affect the rate of photosynthesis

    A by-product of the photosynthesis reaction is that oxygen gas is given off and is used by both plants and animals in aerobic respiration. I have already shown the equation, and this shows how the plant harnesses the sun's energy using it's chlorophyll to react the water and light together for photosynthesis to produce glucose and oxygen.

  1. How Light Intensity Affects the Rate of Photosynthesis

    -Temperature - In a plant, enzymes are used to control photosynthesis reactions in a plant. Therefore if the temperature of the water increases, the rate of photosynthesis will increase until the pondweed becomes denatured. I am maintaining a rough constant temperature for all the tests as each time the water is coming from the taps at around room temperature.

  2. Factor affecting the rate of fermentation.

    * Wear lab coats and goggles if it's necessary. * Set up the apparatus as the diagram has shown. Technique: * Mix water with glucose solution (2 moles ), to dilute it into 0.5 Mole, 1.0 Mole and 1.5 Mole. * Measure 3g of the yeast * Put the yeast into the boiling tube.

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