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

In this investigation the effect of nitrate concentration on the growth of plants will be investigated. This will include the finding of the minimum concentration to have a positive effect on the growth. The plants that I am going to study are cress

Extracts from this document...


Investigating the effect of nitrate on cress plants Aim In this investigation the effect of nitrate concentration on the growth of plants will be investigated. This will include the finding of the minimum concentration to have a positive effect on the growth. The plants that I am going to study are cress and the nitrate that I will be using will using will be sodium nitrate. Background information. Plants have five requirements for living: - Carbon dioxide, this is needed for photosynthesis. Oxygen, this is needed for respiration. Organic nutrients, a few plant cells make their own nutrients, such as glucose by photosynthesis. Inorganic ions and water, all plants need these to grow and they are taken up by the roots and up the stem and soluble from soil water. Water, raw material for photosynthesis and manufacturing osmotic potential of cells and support of the plant. The factor that I am going to investigate will be how nitrates will affect how cress seeds grow. Plants require nitrates to make essential amino acids. Proteins that are made from these amino acids are essential in cells because they are an important part in cell structure (plasma cell membrane). ...read more.


Add the same amount of solution in each dish - labelling each dish with what concentration of nitrate is in each one. Step 4. Leave for 4 days watering everyday so the seeds can germinate. Step 5. When the seed start to germinate, I can then start to measure the rate at which they grow. To do this I must take out 3 cress seedlings at a time stretching them, (making sure I don't snap the end of the root), against a ruler and measure how long they are. What equipment will I need? Petra dishes - this will contain my growing medium, they are sterile so I will be able to avoid moulds becoming established and affecting my results. Cress seeds - this is the plant that I am going to be investigating. I will be using 18 cress seeds during my investigation. Nitrate solution - this will be varying in concentration and will be my independent variable. Distilled water - to dilute the solutions. My dependant variable will be length of cress seeds. To make sure that all my results are fair I must be able to control my variables. This means I must be aware of what the environment is like around the perti dishes and what sort of light is available. ...read more.


The errors of this investigation are that I may have not pulled the seeds tight enough across the ruler to measure them. Another error is that I may have pulled a part of the root hair off when I teased the seedlings out of the cotton wool. The results I got were good enough to create a graph that looks like there is a curve forming, looking at the second graph I have drawn on the computer, if I carried on my investigation for another 8 days the graph shows what the graph might look like. I think possible ways in which my investigation could be improved are; * Wait for about 3 days to let the seeds germinate and start to grow. Then add the nitrate solutions. * Try out different environments for the seeds to grow. * Leave the investigation to carry on for about one month. * Try and use smaller concentrations of nitrate solutions to find the inhibiting concentration. I think that my overall conclusion was safe. This is because all my results were as accurate that I can make them. I realised about all the limitations that I have mention throughout my investigation and I cam up with a conclusion that didn't match my prediction because of the strength of nitrate solutions. ...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

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 GCSE Green Plants as Organisms essays

  1. Marked by a teacher

    An investigation into the effect of a germination inhibitor on the germination of seeds.

    3 star(s)

    The mean can be found, to be used for standard deviation, and it will be a very reliable mean, rather than just the mean for one concentration which is relying on one seed alone.] 3. Water each of the pots occupied with seeds with 3cm3 of water - use the measuring cylinder to measure this out accurately.

  2. Photosynthesis Investigation

    The products of photosynthesis If you look at the equation for photosynthesis , there are two products called glucose and oxygen. They cannot accumulate in the mesophyll cells indefinitely. A the glucose forms, it is usually stored in the chloroplasts as starch.

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

    This was very inaccurate due to the fact that you ad to rely on yourself for finding the weight and the scale was not electric. A way to improve this would be to actually use the electronic scale which is much more accurate and measures to two decimal places, plus

  2. Investigating The Effect Of Light Intensity On Cress Seedlings.

    8.5cm 8.6cm 8.67cm Graph of Averages - = Line Of Best Fit Conclusion - I found that I was correct in my hypothesis in thinking that the more light the seedlings get, the more they will grow. This is corroborated by the positive correlation in my graph of results.

  1. Broad Bean Investigation.

    to the best of my abilities is that I have written a word of warning on the water bath as it can be dangerous also a note of plead to them not to touch the apparatus. Also I have covered up the switch of the water bath so no one can turn it off and concealed the beaker from view.

  2. The investigation is aiming to look at transpiration.

    Their leaves are reduced to spines, which reduces the surface area from which transpiration can take place and protects the plant from being eaten by plants. CONTROL Laboratory temperature was kept constant as constant as possible throughout the experiment. The same plastic bag was used for both the xerophytes and mesopyhtes plant.

  1. Monitoring living organismsthe more concentration of salt there is, the less growth of the ...

    I would keep on doing this for 2 weeks, so I would know what is happening for the duration of the seeds growth. Monitoring would take place 11.00am and 23.00pm. Every time that I would note down the results, I would write down whether there has been any growth from

  2. Water moves from a high concentration gradient of water to a low concentration of ...

    0.8 The water is moving faster out of the potato. As a result the cell of the potato becomes more flaccid looking very shrunk. From this point the water has moved out of the potato dramatically from 3.23g-2.10 and 40.0mm-36.5mm.

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