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

Investigation into the factor of light and dark affecting woodlice.

Extracts from this document...


Investigation into the factor of light and dark affecting woodlice Predictions It was expected that a woodlice would prefer a damp, dark, but moderately warm surrounding. Normally one would expect to find slaters under logs or concrete slabs in one's garden. Under these large objects, the sun cannot reach directly; therefore it is darker, damper and colder than the surroundings. Nevertheless, in winter we do not see woodlice crawling around very often, and, also at night, it may actually be warmer under such objects, because it looses heat more slowly, so I predict that the woodlice would prefer a dark, damp and a temperature of around 15oC. (The ground temperature of a typical Scottish day). This preference to dark and damp surroundings is mainly due to woodlouse's inefficient water-storage system. A woodlouse, if exposed to heat or light for too long, can die due to the dramatic loss of water. They prefer a moderate temperature, because they are so small, and can be damaged by frost if they are exposed to the extreme of cold, but they don't want such a high temperature, either, because they would start loosing too much water. I would also expect the woodlouse to prefer a surrounding of slightly higher pressure (1.05 ~ 1.1 atmosphere), because water evaporates more slowly under a high pressure. ...read more.


Only one was present in the dry part of the chamber. Figure 2. Temperature of water. In this experiment the woodlouse were exposed to a gradient of water temperature immediately below, starting from 0oC to ~80oC. However, there seemed to be a fairly even distribution of woodlouse in all chambers except the 20oC one. Figure 3. Luminosity. In this experiment the woodlouse were exposed to a selection of lighting conditions, from almost complete darkness to the brightness of a 100 watt table lamp 20 cm above. The woodlice have preferred a surrounding of dim lighting, covered with 80 gsm copier paper. (The luminosity under 80 gsm papers is approximately equal to drawing the curtains up on a dull/rainy day.) Criticisms and Discussion (Possible Errors/Comments) It was impossible to use the photographic technology since all practical work must be ceased by the end of an 80 minutes double period, and I did not possess a Polaroid, therefore a technique of drawing diagram was adopted instead. It was found that the woodlouse would actually settle down to a suitable surrounding unless it is irritated by external means, so this made the counting much easier as well. In experiment 1, a woodlouse settled down in the dry part of the chamber, but it was quite near to the moist part. ...read more.


In experiment 3, the woodlouse preferred the dim lighting rather than complete darkness, but two of them settled in the dark area. It was expected that they would prefer a dim area, because the lower temperature. However, they did not like the dark area, probably because of the nature of the aluminum foil. Aluminum is a metal and thus can transfer heat much more efficiently by conduction. This is probably why that it may actually be hotter under the aluminum foil than under the 80 gsm copier. A piece of black paper should have been used instead. Because of the time limitation, it has been very difficult to do any short-term observation. I think the choice chamber should really have been left for about 5 minutes before woodlouse are allowed in, and a further 15 minutes must be elapsed before the photos may be taken. The photos may also be taken at 1 minute intervals between 10 and 15 minutes, and an average calculated. The procedure should really also be repeated with different samples of woodlouse (e.g. woodlouse from Biology, woodlouse from my own garden, and woodlouse from South of England, or even different types of woodlouse). That would have given us a more generalized result, rather than doing an investigation on "the Edinburgh Academy Biology Department's woodlouse's preference to the environment". ...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


    4 star(s)

    I had to choose a site where we were going to collect data. I had to fill the two trays with water from the stream because we were going to put the invertebrates in on of the trays. I then used the Serber net to catch the invertebrates which we put in one of the trays.

  2. Peer reviewed

    An Investigation into the Effects that Different Light Intensities have on the Speed of ...

    5 star(s)

    I have also taken into consideration the fact that the light might get quite hot. However, fortunately a projector light doesn't seem to get very hot so this should not be a problem Culturing the Woodlice: It will be necessary to keep the woodlice for a few days and so

  1. Photosynthesis Investigation

    Pluck out a plant from the soil - Get another plant which can get water and de-starch both of the plants at the same area and for the same time - After 24 -48 hours take out the plant from the dark area and now give them both some sunlight

  2. Factors Affecting Infiltration Rates

    "Muddy soil" & Dry soil" Type of land Time 1 (seconds) Time 2 (seconds) Time 3 (seconds) Average Time (seconds) Muddy soil 47 50 No infiltration 48.5 Dry soil 5 8 9 7.33 These are graphs showing the results: The graph is showing a very slow rate of infiltration.

  1. Study the condensation of steam at different temperature levels

    Ideally I think that siphoning the water from a water bath, down into another water bath is more suitable for keeping the temperature of the water constant, but as the water is not in the basin for long periods of time, it does not have long enough to cool significantly before being pumped back up to the waterbath.

  2. Yeast Investigation

    This is clearly shown in my graph. As you can see from the graph the low temperatures (30oC and 35oC) both resulted in low bubbles for the beaker and test tube experiment. However a steep increase is shown between 30oC and 45oC. This tells me that the yeast needs hotter environments to let its enzyme, zymase, and work properly.

  1. Factors affecting Germination

    When using the Sweet Genovese Basil as a crop plant it is important to effectively research the optimum conditions of the growing environment in order to produce optimum yields. Some of the factors which should be considered are the climatic conditions such as season and temperature as well as soil quality, soil pH level, nutrients, drainage and irrigation.

  2. Poikilohydry in mosses: an ecological limitation or opportunity?

    Therefore, shoots and leaves tend to lie dorsiventrally flattened on the laminar atmospheric boundary5. The LAI of the moss leaf canopies tends to be greater than that of vascular plants and is comparable in some species (Scleropodium spp.) to the mesophyll/leaf-area quotients of vascular plants indicating scale as important determinants of morphology5.

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