Warm up: Food Chains and Webs

A forest food web includes rodents, snakes, and great horned owls.

Snakes eat rats.

Great horned owls eat mice and snakes.

How will the owls most likely be affected by a sudden sharp increase in

local populations of rodents?

• The owl population will either stabilize or increase.

• The owl population will migrate to another area.

• The owls will have to find another food source or risk starvation.

• Owls will have to compete more with each other for available food.

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Which description relates to an abiotic ecosystem factor?

• Plants growing in the environment provide a source of shelter for

  other organisms.

• New organisms in the environment rely on favorable weather

  conditions for survival.

• Animals in the environment feed on algae and rich organic material

  found in the water bed.

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Which organisms in a wetland would be most impacted by a lack of

oxygen and moisture in the soil?

• decomposers

• algae

• fish

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Which are major abiotic factors that determine the types of plants that

can grow in an ecosystem?

• birds and bees

• precipitation and bees

• precipitation and temperature

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A woodland area where deer live is partially cleared to build homes for

people. Which best describes how the deer population will change as a

result of clearing the land to build homes?

• The deer population will increase.

• The deer population will decrease.

• The deer population will remain the same.

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Which best describes biotic stress in an ecosystem?

• fungi damaging corn fields

• wildfires started by lightning burning a forest

• floods causing land degradation and soil erosion

• high salinity levels in local waters decreasing crop yield

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What term describes how a species meets its need for food and shelter

and how it reproduces?

• niche

• habitat

• environment

Certain types of worms live in the mud at the bottom of lakes. What

does the mud represent for the worms?

• community

• shelter

• niche

• food

“Lions are predators to antelopes in many African ecosystems.” Which is

best being described?

• a population shift

• an abiotic factor

• the lion’s niche

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Which would happen to fish in a pond where the population of algae

increases?

• A decrease in oxygen causes many fish to die.

• An increase in nutrients allows for healthier fish.

• A decrease in nutrients causes fish to become malnourished.

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