Ecosystems Unit Test Review

Which sentence best describes the food chain below? algae ---> plankton ---> fish ---> bird

• The algae eat the plankton, the plankton eats the fish, and the fish eats the bird
• The algae eat the plankton, the fish, and the bird
• Energy is passed from the algae to the plankton, the plankton to the fish, and the fish to the bird

Adam is studying a biome for school and discovers this biome is made up of salt and freshwater. Which biome is Adam most likely studying?

• Estuary
• Lake
• River
• Ocean

What is the original source of all energy? **Your answer should only be 1 word and it should begin with a capital letter**

Which type of animal usually eats both producers and consumers?

• an omnivore
• a carnivore
• a herbivore
• a predator

Which has the greatest effect on the amount of salt in a salt marsh?

• the number of animals living in the marsh
• the closeness of the marsh to the ocean
• the depth of the water in the marsh
• the temperature of the water in the marsh

Which classification best describes herbivores?

• producers
• consumers
• predators
• decomposers

What will be most affected if the decomposers in an ecosystem are removed?

• the spread of disease
• the availability of water
• the quality of the soil
• the distribution of organisms

This is a food chain that includes grass, a grasshopper, and a bird. grass ---> grasshopper ---> bird How is the grass in this food chain best described?

• It is a producer, because it makes its own food.
• It is a producer, because it is eaten by consumers.
• It is a consumer, because it gets energy from producers.
• It is a decomposer, because it breaks down sunlight.

Which would most likely cause a decrease in a population of herbivores?

• an increase in the number of producers
• a decrease in the types of decomposers
• an increase in the types of plants
• an increase in the number of carnivores

A mouse eats seeds and insects. Which best describes the role of the mouse?

• consumer
• decomposer
• herbivore
• producer