Question

identifying biotic & abiotic factors of an ecosystem

1. a local ecosystem includes factors such as foxes, mice, scrub bushes, sandy soil, and warm weather. which of these are abiotic factors?

○ warm weather, sandy soil, and scrub bushes
○ warm weather and sandy soil
○ foxes, sandy soil, and mice
○ foxes, sandy soil, and warm weather

1. which answer best represents a pair of abiotic factors present in a tundra ecosystem?

○ cold wind and frozen water surfaces
○ cold temperatures and scrub bushes
○ sunlight and arctic hares
○ arctic hares and scrub bushes

1. which answer best represents a pair of biotic factors present in a marine ecosystem?

○ seaweed and rocks
○ water and fish
○ dead seaweed and turtles
○ sunlight and kelp

1. which answer best represents a pair of biotic factors present in a forest ecosystem?

○ bear cubs and sunlight
○ ferns and bear cubs
○ sunlight and warm temperatures
○ river water and rocky river beds

1. what is an example of a harmful biotic factor for sea turtles?

○ warmer ocean temperatures
○ more food for turtles to eat
○ presence of seals that hunt turtles
○ more plastic in the ocean

1. what is an example of a harmful biotic factor for dolphins?

○ fewer fish to eat
○ more sunlight shining onto the water
○ colder water temperatures
○ more plastic in the ocean

Explanation:

1. Abiotic factors are non-living components of an ecosystem. Warm weather and sandy soil are non-living; foxes, mice, scrub bushes are biotic (living).
2. Abiotic factors are non-living. Cold wind and frozen water surfaces are non-living tundra components; scrub bushes and arctic hares are biotic.
3. Biotic factors are living (or once-living) organisms. Dead seaweed (once living) and turtles (living) are biotic; rocks, water, sunlight are abiotic.
4. Biotic factors are living organisms. Ferns and bear cubs are both living forest organisms; sunlight, temperatures, water, rocks are abiotic.
5. Harmful biotic factors are living organisms that negatively impact a species. Seals that hunt turtles are living and harmful; warm temperatures, plastic are abiotic, more food is beneficial.
6. Harmful biotic factors relate to living resources or organisms. Fewer fish (a biotic food source) harms dolphins; sunlight, cold water, plastic are abiotic.

Answer:

1. Warm weather and sandy soil
2. Cold wind and frozen water surfaces
3. Dead seaweed and turtles
4. Ferns and bear cubs
5. Presence of seals that hunt turtles
6. Fewer fish to eat