9.13.20 Ecosystems

Which of the following are non living factors in an ecosystem?

• rain, sunlight, and minerals in the soil

• plants, animals, and bacteria

• temperature, animals, and plants

• animals, minerals in the soil, and rain

What is a producers job in an ecosystem?

• to make food and oxygen for animals

• to help plants grow

• to break down dead plants and animals

• to eat plants and other animals and produce carbon dioxide

Why are animals important to an ecosystem?

• They produce oxygen.

• They eat bacteria.

• They break down dead plants.

• They produce carbon dioxide.

What is the difference between biotic and abiotic factors?

• Biotic factors include elements like weather and temperature, while abiotic factors produce carbon dioxide and oxygen.

• Biotic factors are living things and abiotic factors are non-living things.

• Biotic factors exist in an ecosystem, but abiotic factors do not

• Biotic factors are non-living things and abiotic factors are living things.

What is an ecosystem?

• the pattern of weather that affects a particular area

• the life cycle of a plant, from seed to flower

• all living things in a particular environment, like a forest or a desert

• a community of organisms that interact with their environment.

Which of the following correctly shows the cycle of living factors in an ecosystem?

• Bacteria produce food and oxygen; animals eat the plants, breathe the oxygen, and produce carbon dioxide; and plants break down dead animals and produce minerals.

• Plants produce food and oxygen; bacteria eat the plants, breathe the oxygen, and produce carbon dioxide; and animals break down dead plants and produce minerals that help plants grow.

• Plants produce food and oxygen; animals eat the plants, breathe the oxygen, and produce carbon dioxide; and bacteria break down dead plants and animals and produce minerals that help plants grow.

• Animals produce food and oxygen; bacteria eat the plants, breathe the oxygen, and produce carbon dioxide; and plants break down dead animals and produce minerals.

What would happen if there were no non living factors in an ecosystem?

• Plants would be unable to grow and produce oxygen for the animals.

• Animals would grow and flourish.

• The ecosystem would get too much rain.

• Bacteria would become the consumer instead of the decomposer.

Below is a food chain.

grasses crickets mice snakes hawks

Which population would most likely increase if the number of mice decreases?

• hawk

• snake

• cricket

• grass

If all green leaves on the trees in a forest turned brown, how would green insects most likely be affected?

• The insect population would increase.

• Any brown insects would eat any green insects.

• The insects would turn brown immediately after the leaves.

• The green insects would no longer be able to hide from birds.

An owl hunts mice that live in a farmer’s field. After the farmer gathers the crops, the mice have fewer places to hide. Which is MOST likely to happen after the crops are gathered?

• The owl will hunt in a different field.

• The owl will have new material to build its nest.

• The owl will catch more mice.

• The owl will have a hard time feeding its young.