unit 7: community and ecosystems · community with its physical or abiotic environment. food chains...
TRANSCRIPT
UNIT 7: COMMUNITY AND ECOSYSTEMS CHAPTER 19 – 402-410
CHAPTER 20 – 422-440
Please read pages in your textbook
Answer each outcome as a test question to help you study
1.
DOE – different species!
Competitive Exclusion principle & ecological niche DOE
2.
Survival of the fittest
1
2
3
DOE
A
B
If 2 different species have the exact same niche – A or B will happen!
Know the 2 types of succession
Know definitions of all terms above!
DOE
Arrows show the flow of energy throughout the food chain
90% of the energy at each trophic level is used up in all the organisms daily activities, so when it gets eaten – only 10% of the energy is passed on to the next trophic level.
Decomposers are important for recycling of chemicals in the environment
Most organism get carbon by eating
No need to draw – know how it is recycling in the environment
Bacteria important in this cycle!
Nitrogen fixing bacteria take unusable nitrogen and makes it usable for plants – animals then get this usable nitrogen by eating plants and other animals!
Legumes are peas, beans and clover
Denitrifying bacteria changes Nitrates (usable form) back into nitrogen and releases it into the atmosphere!
