Ecosystem Interactions

Which of these is an example of one living thing depending on another living thing?

• cat walking on the sand

• bird building a nest in a tree

• dog warming in the sunlight

• squirrel drinking water

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A meadow has too many rabbits. What would help balance this ecosystem?

• more rain that grass needs
• more foxes that eat rabbits
• fewer foxes that eat rabbits
• more grass for the rabbits to eat

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Which example shows a relationship between a living thing and a non-living thing?

• An insect is food for salmon.
• Water carries a rock downstream.
• A tree gets nutrients from the soil.
• A flower makes food for a butterfly.

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Which of the following is an example of an abiotic factor?

• Flowers

• Sunlight

• Animals

• Insects

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Both living and nonliving things interacting within a defined area makes up a(n) _____________.

• Organism

• Producer

• Consumer

• Ecosystem

Which of the following is an example of a biotic factor?

• Water
• Oxygen
• Rocks
• Leaves

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Mushrooms are helping to break down the remains of a rotting log in the forest. how do the actions of the mushrooms benefit the other plants in the area?

• By returning nutrients to the soil.
• By releasing oxygen into the air.
• By making space for new animals.
• By decreasing the population of herbivores.

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The number of fish in a lake suddenly increases. How will the increase most likely affect the lake?

• There will be less water in the lake.

• There will be fewer insects in the lake.

• More plants will grow in the lake.

• More frogs will live in the lake.

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Which best explains how organisms in an overpopulated community interact with each other?

• They compete with each other for food and survival.

• They occupy different habitats to avoid overcrowding.

• They work together to gather food for their community.

• They use fewer resources so that there is enough for each organism.

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Which will most likely happen to the grasshopper population if the grass population decreases?

• The grasshopper population will increase because there will be less competition.

• The grasshopper population will decrease because there will be more competition.

• The grasshopper population will increase because there will be more food available.

• The grasshopper population will decrease because there will be an increase in the predator population.

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