Factors that affect the population size of an immobile population

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  • Al-Mashrek International School
  • School code: 2108
  • Biology HL
  • Factors that affect the population size of an immobile population
  • Criteria: PL(A), PL(AB), DC, DPP, CE,
  • Bassam Al-Nawaiseh
  • 17/10/2007

Aim: the aim of this experiment is to study the effect of the effect of different light intensities on the growth of the pink clover (trifolium resupinatum) this is done using the quadrate method by defining two regions, region A and region B where both are squares with a side length of 10 meters. But region A is under a tree so the light intensity reaching the pink clover is low, while region B has nothing blocking the sun from it and so has a high light intensity reaching it. Now specific coordinates are specified in both regions and the quadrates are then placed at the place of the coordinates and the number of clover leaf inside them is counted then the total population is estimated using the following equation:

Population size = mean number of organisms in region × total area

                                                       Area of one quadrate

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Rationale:

Plants need light for photosynthesis to occur. Photosynthesis is the production of food compounds from carbon dioxide and water by green plants using energy from sunlight, absorbed by chlorophyll i.e. Photosynthesis is how plants feed.

lightlightlil

6CO2 + 6H2O         C6H12O6 + 6O2

Plants use the light to break down the water molecule into oxygen hydrogen ions and electons, were the hydrogen ions combine with the carbon dioxide to produce organic molecules, while the oxygen is released, and the electrons are used to produce ATP and NADPH+H to power up the production of the organic product TP from GP through the calvin cycle ...

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