4th Review Unit 1

1. Write down the word that is missing:

2. A food chain shows how each living thing gets its food. Some animals eat plants and some animals eat other animals. For example, a simple food chain links the trees & shrubs, the giraffes (that eat trees & shrubs), and the lions (that eat the ________). Each link in this chain is food for the next link. A food chain always starts with plant life and ends with an animal

Complete with the word that is missing:

Animals cannot make their own food. Consumers get their energy by eating food, so they must eat plants and/or other animals. All animals are _________. There are three groups of consumers:

Complete with the word that is missing:

______ are called producers because they are able to use light energy from the Sun to produce food (sugar) from carbon dioxide and water. The process by which plants make food is called photosynthesis.

Complete with the word that is missing:

Animals cannot make their own food. Consumers get their energy by eating food, so they must eat plants and/or other animals. All animals are _________. There are three groups of consumers:

Complete with the word that is missing:

Animals that eat only plants are called herbivores (or primary consumers). Animals that eat other ______ are called carnivores. Carnivores that eat herbivores are called secondary consumers. Carnivores that eat other carnivores are called tertiary consumers.

Complete the missing word:

Animals and people who eat both, animals and plants, are called omnivores. Then, there are ___________ (bacteria and fungi) which feed on dead matter. When an animal dies, decomposers break apart the animal, returning nutrients back into the environment. These nutrients then feed plants (the producers), which completes the cycle and begin a new food chain.

Complete:

A food web consists of many ____ _____ and shows the many different paths plants and animals are connected. For example: a hawk eats a snake, which has eaten a frog, which has eaten a grasshopper, which has eaten grass. However, a hawk might also eat a mouse, a squirrel, a frog or some other animal. The snake may eat a beetle, a caterpillar, or some other animal. And so on for all the other animals in the food chain.

What is the main (most important) idea of the text?

• Decomposers are the last part of the food chain because they break apart dead animals.

• Producers are at the top of the food chain because primary consumers eat producers to begin the cycle.

• The food chain is a cycle of nutrients in the environment made up of producers, consumers, and decomposers.

• Animals can't be omnivores, only herbivores and carnivores.

Read these sentences from the text: "When an animal dies, decomposers break apart the animal, returning nutrients back into the environment. These nutrients then feed plants (the producers), which completes the cycle."

• What is the correct option according to this information?

• When animals are decomposed, parts of them become nutrients that go in the ground and feed plants.

• Decomposers are the most skilled hunters in the food chain because they have no other way to eat.

• Decomposers start the cycle of the food chain because they are the first step in the process.

• Decomposers are not important to the animals and plants in a food web.

Write down a food chain mentioned in the text. Attention! It must contain a:

producer -> a primary consumer -> a secondary consumer -> a tertiary consumer.