Organisms and their environment
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What is the sun the source for in an ecosystem?
Principal source of energy
4 levels of consumers?
Primary, secondary, tertiary and quaternary
What is a food web?
Interconnected network of food chains
What is a producer?
Organism that makes its own nutrients
What is a consumer?
Organism that gets energy from feeding on other organisms
What is a decomposer?
Organism that gets energy from dead or waste organic material.
Impact of humans on food webs?
• Overharvesting food species • Introducing foreign species
How is carbon a nutrient cycle?
Carbon is continuously recycled through the environment.
Describe the carbon cycle
• Carbon dioxide in atmosphere is used in photosynthesis to form complex carbon compounds. Plus lost as respiration. • Carbon is passed up the food chain via consumers. Continuously lost via respiration. (CO2) • Dead animals or waste is digested by decomposers which respire carbon dioxide. (decomposition)
What happens if decomposers don’t cause decay to dead organisms?
Dead organisms are covered under sediment or water before decaying. Plants form peat, => coal after millions of years Animals form oil and natural gas Carbon released from fossil fuels as carbon dioxide during combustion.