Unit 4 Lesson 2 What Are Food Chains - WordPress.com · 9/4/2018 · Unit 4 Lesson 2 What Are Food...

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Unit 4 Lesson 2 What Are Food Chains

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Unit 4 Lesson 2 What Are Food Chains?

Food Chains

• We are fed by the sun !!

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Food Chains

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Food Chains

• A food chain is the transfer of food energy in a sequence of living things.

• In a diagram of a food chain, arrows show how energy moves.

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Food ChainsProducers

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Food Chains

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Food Chains

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You are what you eat

ConsumersEat other living things.

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You Are What You Eat

• Consumers can be grouped according to the types of food they eat.

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• Consumers can be grouped according to the types of food they eat.

• A consumer that eats only plants is an herbivore. A zebra is an herbivore. It eats grasses and other plants.

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• A consumer that eats other animals is a carnivore. A lion is a carnivore.

• A consumer that eats both plants and animals is an omnivore. People are omnivores.

• A consumer that eats dead plants and animals is a scavenger. A vulture is a scavenger.

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• Are these animals herbivores, carnivores, omnivores, or scavengers?

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Hunt or Be Hunted

• Consumers can also be grouped by whether they hunt or are hunted.

• A predator is an animal that hunts other animals. A lion is a predator.

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Hunt or Be Hunted

• An animal that is eaten is called prey. Deer and elk are prey for wolves in the Rocky Mountains.

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Hunt or Be Hunted

• An animal can be both a predator and prey. For example, a frog might eat insects; however, a snake might eat the frog.

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Food Chains

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Food Webs

• Many living things eat more than one type of food.

• A food web shows the relationship among different food chains.

• Food web models use arrows to show who eats what.

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Food Webs

• Make a food chain with these desert organisms.

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Food Webs

• Make a food chain with these desert organisms.

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Changes in Food Webs

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• Changes in food webs can affect all parts of a food web.

• If a living thing disappears from a food web, all living things that depend on it are affected.

• If a living thing is too numerous, resources such as food, water, and living space become limited.

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Changes in Food Webs (In very cold weather)

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Unit 4 Lesson 2 What Are Food Chains - WordPress.com · 9/4/2018 · Unit 4 Lesson 2 What Are Food...

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