• 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

# 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

# Related GCSE Green Plants as Organisms essays

1. ## 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.

2. ## 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

1. ## How does the variable, light Intensity affect the rate of photosynthesis?

In the experiment the HCO3 is the limiting factor. In the experiments I have taken, the concentration is at 3%, but if it were raised the oxygen produced would also be increased. The next section of the curve is not proportional because the gradient of the curve changes towards the end.

2. ## Factor affecting the rate of fermentation.

* Write down the water level each minutes. * Compare the results of different concentration of glucose solutions. Cleanup and disposal: * Wash all the apparatus. * Bring all the apparatus back to the place that it placed before. * Wipe the table. * Wash hands after the experiment. Method 2 (improvement): Preparation: * Draw a result table.

1. ## To investigate the effect of light intensity on the size of a plantain leaf.

Temperature - change in temperature might affect the rate of transpiration. 2. Humidity of the field: - this will also affect the rate of transpiration as it will determine the concentration gradient during osmosis from the stomata. 3. Wind speed - this will affect the humidity of an area. 4.

2. ## Determine the water potential of potato tuber cell with the varying affect of solute ...

15 10 2:3 0.8 20 5 4:1 1.0 25 0 5:0 (Data collection) Firstly, work out the percentage and normal change in mass of the potato. For percentage change you need to: change in mass x 100 / by original mass.

1. ## Factors Affecting Seed Germination Lab - the effect of light

which may have affected the size that the control plants could have possibly reached. It is likely that the control seeds could have germinated much more.

2. ## Experiment Report on Best Fertilisers

It is one of the basic fertilizers as it only offers one nutrient to the plants. Osmocote- Osmocote offers the most diverse and wide range of nutrients to plants, Osmocote is composed of Nitrogen, Sulphur, Phosphorus, Potassium and Calcium and also contains organic seed growing mix to help with faster seed growth.

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