Ecosystem Dynamics and Energy Flow

The video explains ecosystems, focusing on the roles of autotrophs and heterotrophs. It details the classification of consumers into herbivores, carnivores, omnivores, and decomposers, and describes energy flow through trophic levels. The differences between food chains and food webs are highlighted, emphasizing the complexity of feeding relationships. The video concludes with a discussion on environmental stability and the impact of human activities on ecosystems.

What is the ultimate source of energy for all ecosystems?

• The moon

• The wind

• The sun

• The ocean

What is the primary role of autotrophs in an ecosystem?

• To consume other organisms

• To hunt prey

• To produce their own food

• To decompose organic material

Which type of consumer only eats plants?

• Herbivores

• Omnivores

• Carnivores

• Decomposers

What is the role of decomposers in an ecosystem?

• To produce energy

• To break down dead organisms

• To consume plants

• To hunt prey

Which of the following is an example of an omnivore?

• Cow

• Lion

• Bear

• Mushroom

How much energy is typically transferred from one trophic level to the next?

• 10%

• 90%

• 25%

• 50%

What is a food web?

• A diagram showing energy flow from the sun

• A list of all species in an ecosystem

• A network of interconnected food chains

• A simple diagram showing a single feeding path

What happens to biomass as trophic levels increase in a food pyramid?

• It fluctuates

• It decreases

• It remains the same

• It increases

What is the main consequence of human activities like illegal logging on ecosystems?

• More energy flow

• Threat to ecosystem stability

• Stability of the environment

• Increased biodiversity

Which trophic level do producers occupy in a food pyramid?

• First

• Second

• Third

• Fourth