Ecological Interactions and Energy Flow

This screencast covers key concepts in ecology, including the flow of energy in ecosystems, food chains, and food webs. It explains ecological pyramids and the transfer of energy between trophic levels. The video also explores niches and community interactions, such as competition, predation, and symbiosis, providing examples to illustrate these concepts.

What was the reason for having only one summative assessment in the ecology unit?

• Lack of resources

• Time constraints

• Student feedback

• Technical difficulties

In a food chain, what does the direction of the arrow represent?

• The size of the organism

• The speed of the organism

• The lifespan of the organism

• The flow of energy

How does a food web differ from a food chain?

• A food web has no arrows

• A food web is more complex

• A food web is simpler

• A food web only includes plants

What is the primary purpose of an ecological pyramid?

• To categorize different species

• To show the number of organisms

• To illustrate the flow of energy

• To display the types of ecosystems

What percentage of energy is typically transferred from one trophic level to the next?

• 5%

• 10%

• 20%

• 50%

What is a niche in an ecological context?

• A type of food chain

• A specific habitat

• A range of conditions for a species

• A type of symbiotic relationship

Which of the following is an example of a community interaction?

• Photosynthesis

• Predation

• Erosion

• Evaporation

In mutualism, how do the species involved interact?

• Both benefit

• One benefits, the other is harmed

• Neither benefits nor is harmed

• One benefits, the other is unaffected

What is an example of commensalism?

• A lion hunting a zebra

• A tapeworm in an intestine

• Barnacles on a whale

• A bee pollinating a flower

Which type of symbiotic relationship involves one organism benefiting at the expense of another?

• Mutualism

• Neutralism

• Parasitism

• Commensalism