Energy Flow and Ecosystem Roles

Teacher Yan introduces the concept of energy flow in the environment, focusing on food chains and food webs. Key vocabulary such as energy, photosynthesis, consumers, and producers are explained. The lesson covers different types of consumers, including herbivores, carnivores, omnivores, scavengers, and decomposers. The complexity of food webs is discussed, highlighting their interconnected nature. Students are given activities and homework to reinforce their understanding of the topics covered.

What is the primary function of energy in the environment?

• To create new organisms

• To enable movement and change

• To destroy ecosystems

• To provide shelter

Which process allows green plants to make their own food?

• Respiration

• Photosynthesis

• Digestion

• Fermentation

What role do producers play in a food chain?

• They decompose dead matter

• They consume other organisms

• They create their own food

• They scavenge for food

Which of the following is an example of a carnivore?

• Tiger

• Rabbit

• Cow

• Elephant

What is the main difference between scavengers and decomposers?

• Scavengers eat living plants, decomposers eat dead animals

• Scavengers produce their own food, decomposers consume it

• Scavengers are only found in water, decomposers are only on land

• Scavengers eat dead plants and animals, decomposers break them down

In a food chain, what does the arrow represent?

• The size of the organism

• The direction of energy flow

• The lifespan of the organism

• The speed of consumption

How does a food web differ from a food chain?

• A food web is less complex than a food chain

• A food web only includes plants

• A food web is a group of interconnected food chains

• A food web is a single linear path

Why are food webs considered more realistic than food chains?

• They show a single path of energy flow

• They include only producers

• They exclude decomposers

• They illustrate multiple interconnected food chains

Why do food chains and food webs start with plants?

• Plants are the most colorful

• Plants are the fastest growing organisms

• Plants can make their own food

• Plants are the largest organisms

How do predators help maintain balance in an ecosystem?

• By increasing the number of herbivores

• By reducing the number of producers

• By eliminating all scavengers

• By controlling the population of herbivores