Ecosystem Dynamics and Interactions

Mr. Anderson's video on biotic and abiotic factors covers their definitions and examples, such as wolves in Yellowstone and atmospheric carbon dioxide. It delves into biofilms at the cellular level, predator-prey relationships like the snowshoe hare and Canada lynx, and the impact of keystone species on ecosystems, using Yellowstone's wolves as a case study. The video highlights the interconnectedness of life and how changes in one area can affect entire ecosystems.

What is an example of a biotic factor in an ecosystem?

• Water flow

• Wolves in Yellowstone

• Temperature

• Carbon dioxide levels

Which of the following is considered an abiotic factor?

• Animal migration

• Predator population

• Plant species

• Atmospheric carbon dioxide

What is a biofilm primarily composed of?

• Lipids

• Proteins

• Polysaccharides

• Nucleic acids

How do biofilms affect the effectiveness of antibiotics?

• They prevent antibiotics from reaching bacteria

• They have no effect

• They dissolve antibiotics

• They enhance antibiotic action

In the predator-prey relationship, what happens to the predator population when the prey population increases?

• It decreases

• It remains constant

• It increases

• It becomes extinct

What is the primary prey of the Canada lynx?

• Elk

• Snowshoe hare

• Coyote

• Deer

What was the impact of removing wolves from Yellowstone on the elk population?

• Elk population decreased

• Elk population remained stable

• Elk population increased

• Elk population became extinct

How did the reintroduction of wolves affect the coyote population in Yellowstone?

• Coyote population remained the same

• Coyote population decreased

• Coyote population became extinct

• Coyote population increased

What role do beavers play in affecting abiotic factors in an ecosystem?

• They decrease plant diversity

• They build dams affecting water flow

• They increase predator populations

• They increase atmospheric carbon dioxide

What is a keystone species?

• A species that is the most numerous

• A species that has a large impact on its ecosystem

• A species that is the smallest in size

• A species that is the least important