4th grade ch. 4 lesson 2 how do organisms interact
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Ch. 4 Lesson 2How do organisms
interact?
competition• when 2 or more species must
use same limited resources
behaviors that help animals avoid or reduce competition
1. hunting @ different times
behaviors that help animals avoid or reduce competition
2. living in groups– helps animals avoid predators
– work together to hunt for food
lichen• combination of fungi & algae
that live together
lichen• fungi get sugar,
nutrients & water from algae
• fungi shield algae from too much sunlight & warm temp.
Gold dust lichensGold dust lichens
parasite• organism that lives in or on
another organism
host• organism that is harmed by parasite
balsam woolly adelgid-parasite that
harms adult trees
parasite
What kinds of places do
lichens prefer most?
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
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?