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

An Investigation into How Ultraviolet

Extracts from this document...

Introduction

An Investigation into How Ultraviolet Radiation Effects the Growth of Crop Seeds Introduction The ozone layer, also known as the ozonosphere, is found in the Earth's stratosphere. Above is a diagram explaining where the ozone layer is situated in the atmosphere Over 90% of the Earths ozone can be found here. That doesn't mean to say that ozone is only found in the atmosphere. It can be easily produced by any high voltage arc here on earth for example a spark plug and a Van de Graaff generator. The ozone layer was discovered by two French physicists, Charles Farby and Henri Buisson, in 1913. But it was a British meteorologist, G.M.B Dobson who explored its properties by using a spectrophotometer. Above is a diagram of the basic working of a spectrophotometer This instrument was used to measure stratospheric ozone from the ground. Between 1928 and 1958 a worldwide network of ozone monitoring stations was established by Dobson. They still continue to operate today. It was in 1985 that British scientists at the British Antarctic Survey discovered that a hole had appeared during the southern spring in the layer above Antarctica. This was completely unexpected so scientists began to research why the hole had appeared and what it was that had caused it to appear. ...read more.

Middle

Agricultural scientists have responded to these findings with a series of ground-breaking investigations on the effect of artificial and solar UV radiation upon plant growth and development. However most of these experiments have involved the use of UV lamps which usually emit radiation quite unlike the radiation present in the normal terrestrial solar spectrum. After conducting research on the internet I came across an experiment carried out by the United States Department of Agriculture, UVB Monitoring and Researching Program. In this experiment they sampled 16 rice cultivars from several different geographical regions. Each variety of rice was grown in greenhouses which had supplemental levels of UVB radiation. Alterations in biomass, morphology and maximum photosynthesis were determined. One third of all varieties that were tested showed a statistically significant decrease in total biomass as the UVB radiation was increased. For these responsive varieties the leaf area and the tiller number were also significantly reduced. In some varieties the photosynthetic capacity, as determined by the oxygen evolution, had also declined. In this investigation I shall be exploring how crop seeds are affected by UV radiation. I am going to subject two different crop seeds, radish and broad bean, to 20 minute sessions of UV radiation once a week. ...read more.

Conclusion

rough diagram of how I expect the inside of the box to look Above is a picture showing the UVB lamp I am going to use in my experiment Hypothesis I hypothesize that after prolonged exposure to the UVB radiation both sets of crop plants will be affected in the following ways; each plant will show a decrease in growth rate, height and leaf area. However I believe that only one plant will show a decrease in yield of crop. Radish Plant I believe that due to radishes being root vegetables the yield of crop from each plant will not be affected by the UVB radiation as they are not directly exposed to the potentially harmful rays. However I think that the height and growth rate of the plant as well as the leaf area will show an overall decrease due to them growing on the top of the soil and in direct exposure of the UVB lamp. Broad Bean Plant I think that compared to the radish plants the broad bean plants will be directly affected by the UVB radiation as they are not root vegetables and produce their fruit proud of the soil. I would imagine that the yield of crop and growth rate, height and leaf area of the plant will show an overall decrease. ?? ?? ?? ?? ...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 OF THE DIFFERENT SPECIES OF MAYFLY WITHIN THE POOL & RIFFLE

    4 star(s)

    to leak out. SUBSTRATE The nature of the substrate is dependent to some extent both on water velocity and geology. Depositing substrates are the normal in slow flowing and still water, where fine particulate matter and detritus settle out. The silts and muds deposited are often low in dissolved oxygen due to the decomposition of organic matter by micro-organisms.

  2. Marked by a teacher

    An investigation into the abundance of fresh water black fly larvae, Simuliidae, between pools ...

    4 star(s)

    If an organism requires fast flowing water, the middle of the stream is where they would accumulate. Preliminary experiment:- I conducted my preliminary experiments at Embercombe on Exmoor and also at Woodford meanders. At Embercombe, I did a investigation of "Abundance of Freshwater Invertebrates in pools or riffles" Here I became familiar with equipment and procedures.

  1. Marked by a teacher

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

    3 star(s)

    - This should be done twice a day, as said above, once in the morning and then again in the early afternoon. The times that the seeds are given water and inhibitor solution should be clearly noted, and it would be wise to give each pot their doses at around

  2. The investigation is aiming to look at transpiration.

    The normal condition for the mesophyte should be about {200C} because they are land plants. While that of the xerophyte should be dry place because xerophytes are found in dry places such as the desert. TRIALS/RUNS: the experiment was repeated twice with the same apparatus.

  1. An investigation into the effects of different concentrations of lead chloride on the growth ...

    Measure 15ml of distilled water using a measuring cylinder and carefully pour into each petri dish, covering as much of the medium. 3. Using tweezers, place 25 cress seeds carefully on each medium, spacing them apart equally. 4. Place each petri dish into a separate polythene bag and fill with some air.

  2. Solar and UVA Inactivation

    These factors included the intensity of the sunlight and length of exposure time, the species of the bacteria which was being exposed and the type of containers used (Acra et al, 1984). This study also showed that not only bacteria could be affected in this way but also molds and

  1. Broad Bean Investigation.

    but it will range from 20� to 30� * When I water the beaker I will ensure it is always topped up to 150ml and I will make sure I do this every Monday, Tuesday and Friday * I will make sure that the shape and volume of the beaker

  2. An Investigation into Species Diversity with distance along a Pingo.

    The root hair is 'very thin extension of the cells that make up the outer layer or epidermis of a root' (Cambridge, Biology 1). They increase the surface area of the root with the soil, so more water can be taken into the plant by osmosis.

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