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

An investigation in to how Light intensity effects plant biodiversity.

Extracts from this document...

Introduction

An investigation in to how Light intensity effects plant biodiversity. Abstract An investigation as to the effects of light intensity on plant biodiversity. My hypothesis stated that as light intensity increases, so does plant biodiversity. I investigated this through a practical case study of Hounslow Heath, using quadrats and a light meter to measure light intensity. The investigation proved my hypothesis to be correct. Hypothesis As light intensity increases, so does plant biodiversity Variables: * CO2 in atmosphere * O2 in atmosphere * Salinity of soil * Soil moisture * pH level of soil * Nutrient content of soil * Interspecific competition * Temperature * Humidity * Light intensity CO2 Carboxylation reactions occur in the light independent part of photosynthesis in order to produce organic compounds. Carbon dioxide is therefore essential to a plant. Atmospheric air contains carbon dioxide at a partial pressure of approximately 0.04 kPa and it if for this reason that carbon dioxide is often a limiting factor. However a partial pressures of >1.0kPa, CO2 can potentially damage plants. O2 O2 is required for plant respiration; it is a very similar reaction to that of photosynthesis, however respiration uses O2 and C6H12O6 to produce CO2 and H2O. ...read more.

Middle

The macronutrients are only needed in small amounts. These are iron, boron, copper, manganese, chlorine and zinc. Nutrients are essential for plant growth. A plant will grow at its optimum rate until they run out of a nutrient growth then becomes limited. Nutrient deficiency is often shown through discolouration or deformity. Interspecific Competition: This is competition between different species of plant. There is a limit to the availability of essential resources. When these resources are limited, competition increases. High competition will result in a lower growth rate and a decreased ability to reproduce. Competition also reduced population growing too much and acts as a natural form of environmental resistance. Temperature: In order for metabolic reactions to occur, a certain temperature must be maintained. Too cold a temperature however will often lead to plants freezing and dying, too high a temperature will lead to plants becoming easily dehydrated. Background Information Hounslow Heath The heath in Hounslow overlies the Taplow river terrace, deposited by the great river Thames approximately 20,000 years ago. It has formed on a flat gravel drift. This drift means that the soil is slightly acidic and well drained; this is the basis of what makes 'Heathland'. ...read more.

Conclusion

a carrier molecule, react with the electrons from the water molecules. This reaction changes NADP from an oxidised state (NADP+) to a reduced state (NADPH). This process requires a great deal of energy, gained from light energy being trapped by chlorophyll. The light-independent reactions; In these reactions the ATP and NADPH produces are used to reduce CO2. A three-carbon compound, glyceraldehyde 3-phosphate is produced. Lights effect on chlorophyll When light is at the wavelength absorbed by chlorophyll, the rate of photosynthesis is at its optimum. Light absorbed by a chlorophyll molecule is directly absorbed by electrons. These electrons 'excited' and move to an energy level known as photoexcitation. When electrons have absorbed enough energy, they leave their chlorophyll molecule, positively charged, and move out. This process is photoionisation. Within whole chloroplasts each chlorophyll molecule has both an electron acceptor and an electron donor, all three components make up a photosystem. When photoionisation occurs, the acceptor takes up the energised electrons, and the electron donor, donates a pair of electrons, thus making the chlorophyll molecule stable once more. The electrons now within the electron acceptor are carried through an electron transfer system, back and forth, through the thylakoid membrane. It is this process here that generates sufficient energy for ATP to be synthesised from ADP and a phosphate. ...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)

    Interactions with water - leaching and chelation Human processes - ploughing and drainage LIGHT Light is an essential abiotic factor in the ecosystems because it constitutes the main supply of energy for organisms. It affects reproduction, hibernation and migration in animals In streams and rivers the depth of water is not usually enough to limit light availability.

  2. Peer reviewed

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

    5 star(s)

    After having completed the recording at each distance, the footage was rewound until the first readings at 100cm came on the screen. A sheet of acetate was placed on the television screen and secured with blue tack so that it would not slip out of place, 'play' was pressed on

  1. Photosynthesis Investigation

    by doing this experiment I have found out why exactly a plant dies when it is taken out from the soil. LIGHT INTENSITY Aim My aim is to carry out an investigation into photosynthesis. I want to find out if light intensity has any effect on the rate of photosynthesis.

  2. Free essay

    Solar Desalination Plant

    * Chosen: Uniform pressure centrifugal pump, model 15075HS18. * Operates on 3/4 hp motor powered by 115V. * Evaporation rate of fresh water is 0.8 m3/hr. Maximum discharge capacity of this pump is 5.7m3/hr. * This pump is to be switched on for one hour, approximately every five hours, to remove the fresh water.

  1. How temperature affects the rate of photosynthesis.

    For example if a pondweed was denatured at high temperatures, not enough pondweed was available to restart the whole experiment for that particular temperature again. So a different elodea length from a different parent plant had to be used. This plant could have had less number of leaves for the same length (50mm)

  2. Mangrove Soil Analysis

    soil moisture available to plants, since the water which drains off due to gravity is in the root zone too briefly to be absorbed. Prediction: I predict that the Rainforest Soil will have the best water-holding ability however the Inner Zone Mud will hold the least amount of water..

  1. The effects of organic effluent from the seweage on the biodiversty in a freshwater ...

    This prevents photosynthesis which makes oxygen. * Use an oxygen meter to measure the oxygen concentration f the second sample and the difference is a a standard measure of BOD. 10. The results obtained will be used to determine if high BOD in organic effluent rich stream area is the reason for the difference in biodiversty(low)

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

    Since lead chloride is being investigated in this experiment, it is also best to have no other heavy metal ions involved which may be present in the soil. Therefore the three mediums chosen were filter paper, cotton wool, and cotton face pads, as all three were homogenous.

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