Ecology CASC 22-23

What do you know about food chains? They begin with producers and end with top level consumers, usually predators. The graph depicts the relationship between two top-level predators in five counties. What type of relationship is this?

• competitive

• mutualistic

• predator-prey

• symbiotic

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How do the elephants help to maintain the population of birds that you can see perched on their backs in the picture above?

• The elephants supply a place for the birds to nest and reproduce.

• The elephants supply a much needed food source by allowing the birds to eat bugs off their backs.

• The elephants provide diversity in ecosystems by carrying the birds long distances as they travel in herds.

• The elephants provide a fresh water supply by carrying the birds back and forth from their local watering hole.

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A consumer that only eats meat is called a

• decomposer

• carnivore

• herbivore

• producer

Mushrooms, worms, and bacteria are all examples of

• carnivores

• omnivores

• decomposers

• scavengers

An organism that eats both plants and animals is called a(n)

• herbivore

• omnivore

• carnivore

• scavenger

Decomposers complete the cycle of life, returning nutrients to the soil or oceans for use by producers.

In this food web, identify the decomposer

• Grass plants

• bacteria

• arthropods

• nematodes

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A polar bear has a thick layer of fat under its skin. Its body is covered with fur. It has adapted to a very cold climate. What would MOST LIKELY happen to the polar bear if the climate changes and gets warmer?

• The polar bear will probably not survive.

• Nothing will happen to the polar bear.

• The polar bear will lose all its fur.

• The polar bear will now live in warm places.

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An interaction between two abiotic factors would be

• a bear catching a salmon

• lightning strikes a tree.

• the sun warms the ground.

• a bee landing on a flower.

A collection of interacting populations together with all abiotic components in the same area is a(n)

• population

• community

• species

• ecosystem

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The ________ includes the entire planet and all of its living and nonliving parts.

• lithosphere

• community

• biosphere

• ecosystem

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