Biology 2
Biology 2
- Created by: William van Klaveren
- Created on: 01-05-12 11:27
ECOSYSTEM
Collection of different organisms in area together with improtant non living factors such as water supply and temperature
POPULATION
All organisms of a species found in ecosystem form a population
COMMUNITY
Populations of all species found in a ecosystem
HABITAT
Places where specific organisms live
FOOD CHAINS
Show series of feeding relationships at different trophic levels
PYRAMIDS
Numbers: show number of individuals at each trophic level
Biomass: show total dry mass of all individuals with trophic level
Energy: shows amount of energy passing through trophic level over lime
BACTERIA
Denityfing Bacteria : nitrates as energy source + convert to nitrogen gas
Free livoing Nitrogen Fixing: Nitrogen gas to ammonia, to make amino acids and proteins.
Root Nodules Nitrogen Fixing: Ammonia - amino acids and other organic nitrogen containing compounds
Nitryfing Bacteria: Oxidise ammonia to nitrates
POLLUTION
Releasing substances into the environment in amounts that cause harmful effects and which biological processes cannot easily remove.
DEFORESTATION
Cutting down large areas of forests causes problems like destruction of habitats and global warming.
FOOD TEST
Glucose = Benedicks Solution
BLUE -- BRICK RED
Starch =Iodine
YELLOW -- BLUE/BLACK
Lipids = Emulsion Test (Ethanol + Water)
MILKY
Proteins = Bieuret Reagent
BLUE -- PURPLE
DIFFUSION
The net movement of particles from a region of high concentration to a region of low concentration i.e. down the concentration gradient
OSMOSIS
The net movement of water molecules from an area of high water concentration to an area of low water concentration across a selectively permeable membrane.
ACTIVE TRANSPORT
The movement of particles against a concentration gradient using energy
PHOTOSYNTHESIS
Water + Carbon Dioxide ----- Glucose + Oxygen
Convert light energy to chemical energy.
LIMITING FACTOR
Any independent variable, increase in whose value leads to increase in value of dependent variable
Related discussions on The Student Room
- GCSE paper 1 and paper 2 »
- GCSE Biology Study Group 2022-2023 »
- 100 days until A Levels »
- Holding myself accountable; study! »
- GCSE Exam Discussions 2023 »
- Biology a level »
- 10 weeks going from C to A* - Alevel »
- 7 weeks of revision...for medicine...my timetable »
- Biology IGCSE CIE 0610 »
- Access to HE Optometry for UWE bristol »
Comments
No comments have yet been made