Interactions in Ecosystem

Fish in a lake have to compete for space. Different fish have different optimal temperature ranges. The graph below shows the temperature ranges of four fish species.

At which temperature range will there be the most competition for space among these fish species?

• 5°C to 10°C

• 10°C to 15°C

• 15°C to 20°C

• 25°C to 30°C

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Animals from two different species utilize the same source of nutrition in one area. It is most accurate to say that the animals…

• will learn to get along

• will compete for food

• will die because there will not be enough food for both of them

• will learn to eat different foods

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This diagram shows the variety of organisms that live in different tide zones. Mussels are common organisms that compete for space in intertidal (middle) tide zones. If all of the mussels were removed from zone A, which organisms would likely compete for the space in Zone A?

• Periwinkle and Limpets

• Sea lettuce and Chiton

• Sea urchins and Hermit crabs

• Rock louse and Periwinkle

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A community of living and nonliving things in their natural environment

• Community

• Oxygen

• Biotic

• Ecosystem

To come together and have an effect on each other

• Ecosystem

• Organisms

• Interact

• Thrive

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Which of the following is an interaction between 2 living organisms?

• Runoff water collecting into the ocean

• Waves washing sediment onto the beach

• Hummingbird drinking nectar from a flower

• Turtle burrowing into the sand

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Which of the following is an example of a living organism interacting with a non-living thing in its ecosystem?

• Turtle burrowing in the sand

• Oxpecker eats ticks off of bigger animals such as zebras

• Glaciers carving out U-shaped valleys

• Heat from the sun causing water to evaporate from the ocean

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Which of these describes a mutually beneficial relationship between two organisms?

• A dog with worms in its intestine

• A turtle and a snail that both eat grass live in a river

• A honeybee pollinating a plant and receiving nectar for food

• A small fish attached to a shark, eating tiny pieces of the shark's food as it floats

Which of the examples below can BEST be described as mutualism between animals?

• A tapeworm lives in the intestine of a bird and consumes the food that the bird has eaten

• Mountain lions and wolves fight each other for the same deer

• A bird eats parasites off a rhinoceros while the rhinoceros provides protection to the bird

• Rats live in the garbage dump of a town and rarely interact with people

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Cattle egrets forage (feed) in fields among cattle. The egret gets easy access to flying insects stirred up by the cattle, and the cattle don't care if they are there or not.

• mutualism

• commensalism

• competition

• parasitism