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

To test the hypothesis that respiration uses stored food.

Extracts from this document...


Investigating Respiration Investigation 1:To test the hypothesis that respiration uses stored food. 1. The dry mass and not the wet mass of the beans was measured because water would add to the weight and would distort the results. As water is created during respiration, getting rid of the water will show if the water is used. 2. You would find the dry mass of a bean seedling by, after removing the bean from the cotton wool, drying it. By placing it in the oven it will not burn it to a crisp but merely dry out. After it has been done once and weighed, it must be done again and again until two successive results are the same. 3. If the seeds had been kept in the light rather than in the dark, they would have germinated, and that would have affected the results, as the seedlings would have grown. ...read more.


Investigation 3:Investigating the gases used and produced in respiration 9. The purpose of the water bath in this experiment is to keep the two test tubes at the same temperature, to keep the experiment fair. 10. The rise in the liquid level in the capillary tube connected to the germinating seedlings, compared to no change in the tube connected to the glass beads, is because oxygen has come out and filled up the tube. This is because the carbon dioxide has been absorbed by the limewater, and so the only gas that can come through is the oxygen. 11. For this experiment, a better control than glass beads would be to take some seedlings which had been killed. Then, there would be no way of respiration, as the seeds would be dead, and they would be very similar to the things used in the experiment, making it fairer. ...read more.


the beans) and that after it has happened there is actually less of the food left than there was before, showing how it actually uses it up. In the second experiment, we saw how glucose is almost entirely broken down by the body for respiration, due to the amount of radioactivity in the carbon dioxide that the rats breathed out. In the third experiment, we saw how not only carbon dioxide is created in respiration, but also another gas. Due to the soda lime absorbing the CO2, there must have been another gas which pushed the coloured liquid up the tube. These are likely to be hydrogen and oxygen, which is water, and could have gone through and pushed up the level of liquid. In the fourth experiment, we saw how the seeds also gave off energy, which created the heat, Therefore, the word equation is: Glucose + oxygen = carbon dioxide + water + energy C6H1202 + 602 = 6CO2 + 6H20 + 2880kJ ...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

    'An investigation into the ability of two strains of the yeast Saccharomyces cerevisiae to ...

    4 star(s)

    respiration rate was reduced by 14.4% and when galactose was available for respiration the rate dropped by 7.2%. When galactose was made the available substrate for baking yeast, the rate of respiration fell from 0.716 (as with the control) to 0.686 arbitrary units, which is a reduction of 4%.

  2. An investigation into the distribution of adult and juvenile limpets on a rocky shoreline.

    The upper shores are much more exposed to the sun during the day and are left uncovered by the seawater for the longest period of time. The limpet does hold a certain amount of water in its shell to use for respiration when it is uncovered by the sea and

  1. To investigate how much energy (Kj) is stored in different types of peanuts and ...

    The blue flame will be directly under the peanut to obtain optimum results. 4) Remove the Bunsen burner away from the peanut, for safety and accuracy because it might affect the surrounding temperature and could affect my results. 5)

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

    This in turn stops plant growth. Lead also inhibits the plant growth regulators. Gibberellins are plant growth regulators that promote stem elongation and seed germination. They can be found in many parts of the plants, in particular it is concentrated in areas such as young leaves, seeds and stems where growth is important.

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

    The yeast itself. - Glass Several pieces of equipment contain glass, which, if smashed, can easily cut the epidermis. Conductor of the experiment / colleagues. The equipment made of glass are: * 100 cm� Measuring Cylinder. * Conical Flask. * 100 cm� Beaker.

  2. Energy absorbed by a bouncing ball.

    It is important that I keep as many of the variables constant as possible so that my experiment is fair and so that I can receive reliable results to conclude from. Risk Assessment When carrying out my experiments I have to be aware of any risks that are involved.

  1. Flat periwinkle Investigation

    Background Reading (Fish JD and Fish S 1996) revealed that flat periwinkles generally preferred sheltered environments, and as the nearest sheltered shore available was at Angle Point. It was decided that data would be collected from this site. Moreover as the investigation relied on a detailed knowledge of the structure of the shoe (with reference to the upper,

  2. Weed study. Dandelions - descrption and characteristics. Investigation to dandelion distribution.

    Equipped with parachutes of fine hairs, the fireweed's seeds float on the breeze to sow themselves throughout burned-over lands. Thriving on the nitrates they find in the ashes, the fireweeds assist the process of reforestation by stabilizing the soil, thus halting erosion.

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