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

Germination Inhibitors

Extracts from this document...


Hypothesis: Tomato Juice inhibits the germination of Lettuce seeds Null Hypothesis: Tomato juice has no effect and does not inhibit the germination of Lettuce seeds. Statistical Test: I intend to use standard deviation for the mean values for day 4, as this statistical test will allow me to measure the spread of the data. It is useful in comparing sets of data which may have the same mean but a different range. Standard deviation is the most common measure of statistical dispersion, measuring how spread out the values in a data set is. If the data points are all close to the mean, then the standard deviation is close to zero. If many data points are far from the mean, then the standard deviation is far from zero. If all the data values are equal, then the standard deviation is zero. From working out the standard deviation, I can then use this figure to evaluate the 95% confidence limits. This test is used for investigations involving looking for differences between different measurements of different samples. Confidence limits provide a quick way to determine whether there might be statistically significant differences between the means of two or more samples. ...read more.


that had germinated, whereas the rest of the seeds had not germinated. This also gives the wrong average. My results are statistically significant, as they reject the null hypothesis; I have found out that tomato juice does have an effect on the germination of lettuce seeds. I reject the null hypothesis, because the group results clearly proves that the more concentrated the tomato juice is, the more of the inhibition effect it has upon the germination of the lettuce seeds. My results show that the more diluted the tomato juice, the germination of the lettuce seeds take place at the normal rate, where the dormancy stage is broken. Less germination will take place in the presence of more concentrated tomato juice. The general trend is, as the concentration of the tomato juice increase, the rate of germination decreases. Biological Knowledge: The tomato juice contains an enzyme which inhibits the germination of lettuce seeds. Enzymes are protein molecules, having a three-dimensional globular tertiary structure. 20 different amino acids that occur naturally and make proteins have the same general structure. There is a central carbon atom, to which four groups of atoms are attached. ...read more.


Molecules with a similar shape to the usual substrate can attach itself to the active site, called an inhibitor. This prevents the normal substrate from attaching to the active site, and then forming a reaction. Molecules of the competitive inhibitors block the active site, where fewer molecules of the enzyme are available for the normal reaction, and therefore, the reaction rate is reduced. Some substances inhibit enzyme reactions by attaching itself to a different part of the enzyme. This distorts the active site enzyme so that the substrate can no longer bind with the enzyme. These substances are called non-competitive inhibitors. The shape of the non-competitive inhibitors can be completely different from the usual substrate and the inhibitor may remain permanently attached to the enzyme. The enzyme is therefore useless. In this way, the germination inhibitor achieves maintaining dormancy, and the seed is not allowed to germinate. When the inhibitor is removed, the germination process can occur. To classify the tomato, species are organised into biological categories, which the tomato comes under the biological kingdom "plantae". Species are grouped into biological categories of decreasing similarity. The largest category is the biological kingdom, of which there are five. Category Tomato Kingdom Plantae Phylum Angiospermophyta Class Dicotyledoneae Order Solanales Family Solanaceae Genus Lycopersicon Species Esculentum ...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 Molecules & Cells 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 Molecules & Cells essays

  1. Marked by a teacher

    An investigation into the inhibiting effect of tomato juice on the germination of cress ...

    3 star(s)

    By inhibiting the growth of other seeds they are in effect reducing inter-specific competition for essential nutrients and therefore are more likely to flourish. They will be able to gain the light, carbon dioxide, heat, etc, first and hence grow taller and maybe even block off light to the plants below them.

  2. Design an Experiment to Determine the Effects of Copper Sulphate Concentration on the Germination ...

    As it coils up a large amount can fit into a small space. Figure 3 shows the starch molecules (stained with iodine) stored in the cotyledons. Fig 3: Storage of Starch in the Parenchyma of the Bean Cotyledon The amylase breaks down the starch stored in the cotyledons of the seed into maltose.

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