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What is community?
individuals of different populations exist
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INTERspecific interaction:
interaction between species
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INTRAspecific interaction:
interaction within species
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4 types of Interspecific Interaction
- Mutualsim
- Predator/Prey
- Parasite/Host
- Competition
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Mutualism:
both species gain
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Predator/Prey
- predator gains
- population control
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Parasite/Host:
Ex. HIV-humans, mistletoe-trees, tapeworms-dogs
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competition:
- competing for resources
- plants
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2 types of plants:
- Gymnosperms: plants with canes (evergreens-spruce, fir)
- Angiosperms: produce flowers- fruit
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Roots are used for
- water absorption and nutrients (root hairs increase absorption)
- support and stability
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Stem is used for
- transports water ans sugars
- support
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Leaves are used for
photosynthesis, transpiration
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Flowers (specialized leaves)
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Modifications (Root):
Storage (ex. carrot, turnip)
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Modifications (Stem):
- Nodes and internodes
- GROW HORIZONTALLY:
- Rhizome-grows undeground (sugarcane)
- Stolon-grows above ground
- GROW VERTICALLY:
- Bulbs- fleshy leaves (onion)
- Corms- Papery leaves
- tuber- enlarge portion
- thorn- modified section of stem
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Modifications (Leaves):
- Succulent- used for water storage
- Spines- protection
- Trap- traps insects and digestion
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Environment-->Selection:
- Natural Selection: selection done by nature, selects favorable characteristics
- Artificial Selection: selection done by humans
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