environmental impacts


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  • B4 Summary
    • Ecology in the local environment
      • An ecosystem includes all living things and their surroundings,Where an organism lives is called its habitat
      • Capture-recapture data assumes no deaths,immigration,emigration. Identical sampling methods. Survival rates not affected by marking organisms
      • The distribution of organisms can be mapped using a transect line and displayed as a kite diagram
    • Photosynthesis
      • Photosynthesis is a two stage process ; Light energy splits water into oxygen gas and hydrogen ions. Carbon dioxide gas combines with the hydrogen to make glucose and water
      • Isotope experiments showed that the oxygen comes from water.
      • The balanced symbol equation for photosynthesis is 6CO2 + 6H20 - C6H12O6+ 6O2
      • Carbon dioxide, light and temperature are limiting factors in photosynthesis
      • Leaves are adapted for efficent photosynthesis - Large surface area,thin,contain pigments, have vascular bundles and guard cells
    • Diffusion and osmosis
      • Diffusion is the net movement of particles from a high concentration to a low concentration
      • The rate of diffusion is increased by a shorter distance, a greater concentration gradient and a greater surface area
      • Transpirationis the evaporation and diffusion of water from leaves
    • Minerals and farming
      • Plants require nitrates for cell growth,phosphates for respiration and growth, potassium for respiration and magnesium for photosynthesis
      • Organic farming uses animal manure,crop rotation,weeding and differing planting times
      • Minerals are absorbed by active transport,which needs energy
      • Detritovres feed on dead and decaying material
      • Saprophytic fungi use extracellular digestion
      • Intensive food production improves the efficiency of energy transfer


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