I am doing this so I can compare the results of a wheat seedling grown in a normal culture solution, to a seedling grown in a solution that is missing a certain mineral.
I predict that all of the seedling will grow, but the seedling that is in the normal culture solution will grow the better than the rest, because it supposedly has all the minerals that a plant needs to grow. So because all the other solutions have an element(s) missing, the seedling growing in them will not be supplied with all the minerals that they need to grow properly.
Predation
The seedling in the solution with no Magnesium will be small and its leaves will be yellow from the bottom upwards and small, because there is no Magnesium to make chlorophyll, and without chlorophyll the plant cant photosynthesis.
The seedling in the solution with no nitrates will not grow very well, and will be small and yellow, with small leaves and a thin, weak stem.
The seedling in the test-tube containing distilled water will hardly grow at all, because the water has had all the minerals removed from it.
My method will be to wrap a healthy wheat seedling in a small peace of cotton wool, and then insert the cotton wool into the top of one of four test tubes, containing one of the solutions planned below:
- Distilled water. (All minerals missing)
- Normal culture solution (Supposedly has all the elements that a plant needs to grow.)
- A solution that contains no Nitrates.
- A solution witch contains no Magnesium.
I will then wrap the test tubes in aluminium foil, to exclude the light, so that green alga will not be able to grow in the test-tube, so it should not impede in the experimentation.
I will then situate the four test tubes into a test-tube rack.
I will then place the rack indoors in a sunlit place, and then leave them there for 5 weeks, each week I will check on them, and measure the growth (length) and complexity of the leaves and the roots.
Week 1
In week, one I put the seedlings into the test tubes.
Week 2
After the first week, all of the seedlings have grown. The shoots and roots have become larger and more complex. The seedlings have rooted and secured them selves the cotton wool, and there roots have grown down into the solutions.
Week 3
There are no results for week 3, because we were all on Half Term.
Week 4
After the third week, mostly all of the seedlings have grown larger. The shoots and roots have become larger and more complex.
Week 5
After the forth week mostly all of the seedlings have grown larger. The shoots and roots have become even larger and more complex.
I think that my results differ from the results from other people.
My prediction dose not mach my results, for all of my seedlings, for example, the wheat seedling growing in the solution with no Magnesium grew better then the seedling growing in the normal culture solution.
I have discovered that the seedlings that grew in the Distilled water and in the solution with no nitrates only grew to half the size of the seedling growing, in the normal culture solution and the solution with no Magnesium.
I have found out that the seedling growing the solution with no Nitrates is as I predicted small and yellow with small yellow wilting leaves.
The seedling growing in the distilled water has hardly grown
However, I predicted that the seedling in the solution with no Magnesium will be yellow from the bottom up but my seedling has grown very well, and is green and healthy. It has grown to be even bigger than the control seedling (normal culture solution).
I do not know why the seedling in the solution with no Magnesium grow so well, it could be because I got the solutions mixed up when I put them into the test tubes, although most of the other peoples results for the no Magnesium are the same, with the no Mag. growing very well.
So it looks like it could be because the person that made up the solutions made up the no Mag. incorrectly so that could be whey everybody’s results are the same, or it could be because the seedling that we all used had same strange reaction to the no Mag. solution.
There is one anomalous result, the seedling growing in the solution with no Magnesium should, as most science books say ‘The seedling in the solution with no Magnesium will be small and its leaves will be yellow from the bottom upwards and small’ although my results and the rest of the class’s results do not do this.
I think that my experiment did not work out that well, because of this anomalous result for the wheat seedling that was supposedly growing in the solution with no Magnesium, but it might not have been the solution with no Magnesium.
It also did not work out well because I only recorded the length of the shoots and roots once a week, and because of half-term was in the middle of when the seedlings where growing, I in total only got 3 results.
If I was to do this experiment again, I would do it more thoroughly, for example, I would plant 25 wheat seedlings in each of the four solutions and then measure the seedlings each day for 6 weeks, instead of only one seedling for each solution. This type of readings will give me a better set of results, because is there are anomalies results from one or two of the plants, they will not have a big effect on the overall result.
GCSE BIOLOGY book D.G. Mackean 1986
