4th grade ch. 4 lesson 2 how do organisms interact
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Ch. 4 Lesson 2How do organisms
interact?
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competition• when 2 or more species must
use same limited resources
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behaviors that help animals avoid or reduce competition
1. hunting @ different times
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behaviors that help animals avoid or reduce competition
2. living in groups– helps animals avoid predators
– work together to hunt for food
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lichen• combination of fungi & algae
that live together
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lichen• fungi get sugar,
nutrients & water from algae
• fungi shield algae from too much sunlight & warm temp.
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Gold dust lichensGold dust lichens
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parasite• organism that lives in or on
another organism
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host• organism that is harmed by parasite
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balsam woolly adelgid-parasite that
harms adult trees
parasite
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What kinds of places do
lichens prefer most?
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Lichen Location Color Distance from ground (cm)
Type of surface (tree, rock, etc.)
Environment (sunny or shady)
1.
2.
3.
4.
5.
Likin’ Lichens Hunt
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Likin’ Lichens1. What kinds of surfaces do lichens grow on?
2. Do lichens seem to grow more in sunlight or shade?
3. Do lichens seem to grow more near the ground or away from the ground?
4. Do lichens seem to grow more in moist areas or dry areas?