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

Rates of respiration in crest plants, which are grown in different soils with a different pH

Extracts from this document...

Introduction

Caroline van Bommel 23-04-2002 Group 4: Chemistry Lab Title: Rates of respiration in crest plants, which are grown in different soils with a different pH Aim: To measure the rate of respiration in Crest seeds which were embedded in different soils. Hypothesis: I think that the seeds, which are embedded in the soil sample with the most neutral pH, will show to have the highest rate of respiration. Variables: Control- amount of water added, the amount of soil, the amount of Crest seeds, the temperature of the soil and the duration of the experiment Independent- the area where the soil sample is from. Dependant- the amount of O2 consumption. Materials: For part 1 of the experiment Glass filter 100 mL Erlenmeyer flask For part 2 of the experiment Erlenmeyer flask 250 mL 100 mL beaker 10g of soil (either forest, moss, or potting soil) ...read more.

Middle

3) These aluminium packages must be placed it in the oven at 200oC for 30 minutes (so that all the water and organic matter will be desiccated.) 4) I placed 10 g of the backed soil in 8 ml of water and I stirred it gently. 5) Then I placed 10 drops of universal indicator fluid in the solution. (It was hard to see the colour, so we...read the next step) 6) With the aid of a filter I filtered out all the non-dissolved soil components, I repeated this until I had a clear solution left. 7) Once u have obtained a clear solution you can measure the pH of it. Part 2 1) Collect materials 2) From each type of backed soil we took 10g sample and placed it in the Erlenmeyer flask. ...read more.

Conclusion

Time Treatment 1 (mm3) Treatment 2 (mm3) Treatment 3 (mm3) 0 0.00 0.00 0.00 3 0.01 0.01 0.00 6 0.02 0.01 0.00 9 0.02 0.01 0.02 12 0.02 0.01 0.04 15 0.03 0.02 0.05 (The reason why I didn't continue recording the rate of respiration is because about 15 seconds after I hit the 15-minute mark the bubble in the treatment 3 pipette popped and directly after that the bubble popped in treatment 2 and then about a couple of seconds after that the bubble in treatment 1 also popped.) Graph 1: The amount of O2 intake in a time span of 15 min Table 3: The amount of Crest seeds that had sprouted after 4 days. Treatment nr. Origin of soil % Of Crest seeds that had sprouted 1 Forest soil 20% sprouted 2 Soil from underneath a moss plant 25% sprouted 3 Regular potting soil 90% sprouted ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our AS and A Level Energy, Respiration & the Environment 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 AS and A Level Energy, Respiration & the Environment essays

  1. Marked by a teacher

    Tuberculosis and its treatment

    4 star(s)

    Pathogenesis of Tuberculosis Tuberculosis is an infectious disease caused by the microoragnism Mycobacterium. It can affect several organs of the human body, including the brain, the kidneys and the bones, bout most commonly, it affects the lungs ( pulmonary tuberculosis).

  2. Energy absorbed by a bouncing ball.

    depend on the ball and its properties, what it is made from, size and mass. The first graph that I decided to plot was of the initial height of the ball when dropped and the rebound height of the ball.

  1. Testing the Physical and Chemical properties of soils .

    Soil with a lot of clay in it is known as a clay soil; soil with a lot of sand in it is known as a sandy soil; soil with a lot of organic matter in it is known as organic soil, which is usually known as peaty soil and

  2. Investigating how prolonged exposure to its optimum temperature affects the respiration of yeast.

    * Conical Flask. * 100 cm� Beaker. * Stirring Rod. * Thermometer. * Delivery Tube. Kettle Possibility of scalding, especially with just recently boiled water. Conductor of the experiment / colleagues - While there are only two risks, it is imperative that the risks are minimised. Therefore, the experiment has to be conducted with utmost care, and

  1. Investigating the effects of different lead chloride concentrations on the growth of cress seedlings

    The electrons are currently at a low energy level. However once they are transferred to photosystem II (p680) by electron carriers, the absorbed light energy excites the electrons to a higher energy level. Before the electrons can lose this energy as thermal energy, they are captured by an electron acceptor and passed onto photosystem I (p700)

  2. out how different concentrations of the enzyme pectinase affect the degradation of the substrate ...

    * Enzyme inhibition. If there are more inhibitors, competitive or non-competitive, compared to the substrate concentration this will reduce the reaction rate in which juice flows. This is because competitive inhibitors compete for the active sites hence leaving less active sites for the pectins (the substrates)

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