B2 Summary
- Created by: Ibzay101010
- Created on: 18-05-13 12:14
View mindmap
- Energy Flow and Recycling
- Pyramids of biomass and numbers can show feeding relationships
- Pyramids of biomass are harder to construct but always form pyramids.
- Energy is lost from each stage of a food chain
- Food chains are limited to a small number of trophic levels
- Energy is lost from each stage of a food chain
- Pyramids of biomass are harder to construct but always form pyramids.
- The recycling of Nitrogen involves the action of four types of bacteria
- Nitrifying Bacteria - Ammonia to Nitrates
- Denitrifying Bacteria - Nitrates to Nitrogen gas
- Nitrogen-fixing Bacteria - live in root nodules. Fix nitrogen gas
- Decomposers (Soil Bacteria and Fungi) - convert proteins and urea to ammonia
- The recycling of Carbon involves Photosynthesis, Feeding, Respiration and Decompostition
- Pyramids of biomass and numbers can show feeding relationships
- B2-Understanding Our Environment
- Classification and Living Together
- Organisms can eat each other (predators)
- Organisms can gain from each other (mutualism)
- Organisms can feed off of each other (parasites)
- Organisms can gain from each other (mutualism)
- Organisms are classified into discrete groups starting with Kindom and ending with species.
- It is difficult to classify intermediate organisms, hybrids and asexual organisms
- Organisms are classified using natural systems
- This gives information about evolutionary relationships
- Similar organisms will compete with each other for food
- Organisms that share the same niche or are in the same species will compete more
- Organisms can eat each other (predators)
- Energy Flow and Recycling
- Pyramids of biomass and numbers can show feeding relationships
- Pyramids of biomass are harder to construct but always form pyramids.
- Energy is lost from each stage of a food chain
- Food chains are limited to a small number of trophic levels
- Energy is lost from each stage of a food chain
- Pyramids of biomass are harder to construct but always form pyramids.
- The recycling of Nitrogen involves the action of four types of bacteria
- Nitrifying Bacteria - Ammonia to Nitrates
- Denitrifying Bacteria - Nitrates to Nitrogen gas
- Nitrogen-fixing Bacteria - live in root nodules. Fix nitrogen gas
- Decomposers (Soil Bacteria and Fungi) - convert proteins and urea to ammonia
- The recycling of Carbon involves Photosynthesis, Feeding, Respiration and Decompostition
- Pyramids of biomass and numbers can show feeding relationships
- Adaptation and Natural Selection
- Organisms in hot, dry areas have adaptations to: increase heat loss, move on sand and cope with a lack of water.
- Organisms in cold conditions are adapted to: keep warm and move on the snow
- Heat loss of an organism depends on its surface area to volume ratio
- Organisms in cold conditions are adapted to: keep warm and move on the snow
- Darwin's theory of natural selection involves variation, competition, survival of the fittest and selective reproduction
- Darwin's theory was widely criticised at first, but is now widely accepted
- Examples of natural selection are: warfarin resistance in rats, antibiotic resistance in bacteria and colours of peppered moths
- Darwin's theory was widely criticised at first, but is now widely accepted
- Organisms in hot, dry areas have adaptations to: increase heat loss, move on sand and cope with a lack of water.
- Population, Pollution and Sustainability
- Pollution can be measured using direct methods or by using indicator species
- The human population has been increasing exponentially
- This has led to an increase of pollutants
- E.g. Carbon Dioxide - Global Warming, Sulphur Dioxide - Acid Rain, CFCs - Breaking down ozone layer
- This has led to an increase of pollutants
- Removing waste, producing food and supplying energy sustainably will help conserve habitats and organisms
- Conservation is important to:
- Protect our food supply
- Prevent damage to food chains
- Protect organisms for medical uses
- Protect habitats for tourism
- Conservation is important to:
- Classification and Living Together
Comments
No comments have yet been made