The video explains the concepts of food chains and food webs, highlighting the flow of energy through ecosystems. It describes how chemical energy moves from producers to consumers, including herbivores and carnivores. The video emphasizes the importance of biodiversity and interdependence among species, illustrating how changes in one species can affect the entire ecosystem. It concludes by discussing how biodiversity contributes to ecosystem stability.

What do food chains and food webs help us understand in an ecosystem?

• The flow of water

• The flow of energy

• The flow of nutrients

• The flow of air

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In aquatic ecosystems, what are the main producers?

• Trees

• Grasses

• Phytoplankton and algae

• Shrubs

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What is the role of autotrophs in an ecosystem?

• They decompose dead matter

• They produce their own food

• They consume other organisms

• They compete for resources

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How is chemical energy transferred from producers to herbivores?

• Through respiration

• By decomposing matter

• By consuming plants

• Through photosynthesis

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What do the arrows in a food chain represent?

• The direction of air flow

• The direction of chemical energy flow

• The direction of nutrient flow

• The direction of water flow

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What do food webs illustrate in an ecosystem?

• The flow of water

• The interdependence of species

• The flow of air

• The flow of nutrients

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What happens if one species in an ecosystem significantly changes in population?

• Only that species is affected

• No other species are affected

• Many other species are affected

• The ecosystem remains stable

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What could be a consequence of a sudden decrease in the zebra population?

• More competition for food among predators

• Less competition for food among predators

• More zebras

• More water in the ecosystem

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How does biodiversity contribute to the stability of an ecosystem?

• By eliminating predators

• By decreasing the number of connections in the food web

• By increasing the number of connections in the food web

• By reducing the number of species

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What is threatened when species are lost in an ecosystem?

• Only the producers

• Only the lost species

• The entire ecosystem

• Only the predators

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