Unit 4 Review

Which is most responsible for recycling dead plants and animals in an ecosystem?

• Water
• Bacteria
• Fish
• Insect

How would the woodpecker population in a forest area most likely be affected if a housing development is built in that area?

• They would produce more offspring.
• They would change the color of their feathers.
• They would experience a decrease in available food.
• They would experience a decrease in competition.

Which two ecosystems are aquatic?

• estuaries and forests
• forests and grasslands
• saltwater marshes and estuaries
• saltwater marshes and tropical rainforests

Each food chain ends with which organism?

• consumer
• decomposer
• producer
• scavenger

In a grassland ecosystem, if the population of eagles suddenly decreased, what will most likely be the effect on the rest of the ecosystem?

• The ecosystem will become overpopulated with snakes.
• There will be a decrease in the population of snakes in the ecosystem.
• The nutrition of the soil in the ecosystem will decrease.
• More types of plants will begin growing in the ecosystem.

Which is an example of a decomposer?

• a hawk
• a flower
• a mouse
• a mushroom

Which will most likely cause a decrease in predator populations?

• an increase in prey populations
• a decrease in prey populations
• a decrease in decomposers
• an increase in producers

A simple food chain includes hawks, lizards, and insects. Which will most likely happen to the lizard and hawk populations if a pesticide is sprayed to kill the insects, and the lizard and hawk populations cannot find other food in this ecosystem?

• Both the lizard population and the hawk population will increase.
• Both the lizard population and the hawk population will decrease.
• The lizard population will increase, but the hawk population will decrease.
• The lizard population will decrease, but the hawk population will increase

Which organism is a producer?

• Frog
• Mushroom
• Grass
• Lizard

As more people have moved to the beach, the sea turtle population has decreased. Which is most likely the cause of this decrease?

• tropical storms
• increase in predators
• habitat loss
• warmer temperatures