Energy Transfers in Ecosystems

The video tutorial covers energy transfers in ecosystems, focusing on food chains, food webs, and energy pyramids. It explains how energy flows from producers to consumers and the impact of organism changes on ecosystems. The concept of energy pyramids is introduced, highlighting energy loss at each level. Finally, the video discusses limiting factors and carrying capacity, explaining how these concepts affect population sizes in ecosystems.

What is the primary source of energy for all ecosystems?

• The Moon

• Plants

• Herbivores

• The Sun

What does a food web demonstrate that a food chain does not?

• Energy transfer among a limited number of organisms

• Only the primary consumers

• Energy transfer in a linear fashion

• Energy transfer among all organisms in an ecosystem

How do you identify an herbivore in a food web?

• It does not eat plants

• It is eaten by carnivores only

• It eats both plants and animals

• It consumes plants only

What happens to the deer population if bears are overhunted?

• Decreases

• Stays the same

• Increases

• Becomes extinct

How does the removal of a predator affect its prey population?

• No change

• Becomes extinct

• Increases significantly

• Decreases significantly

What is the role of decomposers in a food chain?

• They are primary consumers

• They produce glucose through photosynthesis

• They break down dead organisms

• They transfer energy to the Sun

What does an energy pyramid illustrate?

• The amount of energy available at each trophic level

• The biomass at each trophic level

• The specific types of organisms in an ecosystem

• The number of organisms at each trophic level

What is a limiting factor in an ecosystem?

• A factor that increases animal populations

• A resource that limits the number of individuals in a population

• A factor that has no impact on population sizes

• A resource that is unlimited in an ecosystem

What is the carrying capacity?

• The maximum number of individuals an area can support

• The total number of plants in an area

• The ability of carnivores to hunt prey

• The speed at which producers generate energy

What percentage of energy is typically lost between trophic levels?

• 50%

• 25%

• 10%

• 90%