environmental impacts
Revison
- Created by: Arron murray
- Created on: 03-04-13 10:19
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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
- Ecology in the local environment
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