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2024 BIOL 1108 UNIT 1 MOUNT ST. HELENS EXAM WITH CORRECT ANSWERS
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2024 BIOL 1108 UNIT 1 MOUNT ST. HELENS EXAM WITH CORRECT ANSWERS
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2024 BIOL 1108 UNIT 1 MOUNTST. HELENS EXAM WITH
CORRECT ANSWERS
What affects the order of reestablishment? - CORRECT ANSWERS-What can
reach the area first?
-By wind(spores/seeds)
-What can survive there?
The first to survive there will be the first to reestablish
Ecosystem - CORRECT ANSWERS-biological community of interacting
organisms and their physical environment
Abiotic and biotic factors
Abiotic Factors that Define Ecosystems - CORRECT ANSWERS-Climate
-Averages and seasonality
Geology
-Bedrock, water, soils, topography
Disturbance
-Natural, human
-Scale and frequency
Biotic Factors that Define Ecosystems - CORRECT ANSWERS-Biodiversity
Species Interactions (Predator-Prey, Mutualism, Commensalism, etc.)
Presence of Invasive or Keystone Species
Ecosystems cannot be defined by - CORRECT ANSWERS-size
boundaries
Mt. St. Helens - CORRECT ANSWERS-Volcano that is part of Cascade
Mountains that erupted in Washington state causing massive damage in
1980
-in temperate rainforest biome
Pre-Eruption Mt. St. Helens Ecosystem - CORRECT ANSWERS-Old Growth
forest
-Never been logged
-Diverse forests and species
Rich soils
-Stimulated plant growth with lots of available nutrients
, Heterogenous ecosystem that changed with elevation
temperate rainforest
Post-Eruption Mt. St. Helens Ecosystem - CORRECT ANSWERS-Forests
scorched up to 17 miles from mt. st helens
Pumice Plain covered in ash so low nutrient levels in soil
Spirit Lake - CORRECT ANSWERS-flooded with muddy ash water and logs
-Murky water, limited visibility
Plant Dispersal - CORRECT ANSWERS-how seeds/spores are spread from the
parent plant
-Purpose: increases chance of survival by limiting competition for resources
(soil nutrients..)
-Methods: wind, animal, water, gravity
Wind Dispersal - CORRECT ANSWERS-A method of dispersal where
lightweight seeds catch the wind
-Long distances, random
Animal Dispersal - CORRECT ANSWERS-Seeds have hooks attached to them
that attach to fur. Other seeds are eaten and pass through the digestive
tract. can be carried far distances but varies
Water Dispersal - CORRECT ANSWERS-Seeds fall into the water and float
away
-Splashes or long distance
Gravity Dispersal - CORRECT ANSWERS-Heavy nuts fall to the ground and roll
Example: Ballistic Dispersal
Ballistic Dispersal - CORRECT ANSWERS-plant catapults/ejects seeds
Ex. lupine
Species - CORRECT ANSWERS-organisms that can produce fertile offspring
Population - CORRECT ANSWERS-all of the individuals of a single species that
interact/breed
The unit at which evolution acts
Community - CORRECT ANSWERS-all of the populations of living things that
interact in a place
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