7th Grade Unit 2 Assessment: Interdependence and Energy Flow in Ecosystems

The word ecosystem refers to

Determine which items are biotic and abiotic.

The orginal source of energy for most ecosystems is

Identify the animal in this food web that obtains nutrients directly from producers.

Match each to create a true statement.

If the population of snakes decreased, what population would most likely increase most rapidly?

How does energy move in the food web picture?

Small organisms that eat and break down dead things are called

Examine the picture. Predict the type of interaction that is shown in the picture between a bee and a flower.

Which of the following is the explanation for the trend seen in the graph above.

An organism that gets energy from both plants and animals is called a(n)

When 2 or more organisms are trying to obtain the same resources (food, water, shelter), they are in what relationship?

What is a close relationship between 2 different species?

Mosquitoes love to suck your blood! What type of symbiotic relationship is this?

Below are five ecological relationships. Match the picture that represents each relationship.

Rabbits introduced into Australia over 100 years ago have become a serious pest to farmers. Rabbit populations increased so much that they displaced many native species of plant eaters. What is the MOST logical explanation for their increased numbers?

Read the passage below and answer the question.

Birds

Peter observed different birds around his home such as Eastern bluebirds, tree swallows, and starlings living in trees. He decided to study their different interactions. Peter remembered in class that Eastern bluebirds and tree swallows compete for places to live (called nesting sites). In competing for these nesting sites, the tree swallows often win. The starlings do not compete for these nesting sites because starlings cannot fit inside the nesting sites of bluebirds and swallows.

Every day for 5 months, Peter observed and counted the Eastern bluebirds, tree swallows, and starlings in nesting sites around his house. Using this data he created this graph.

Using the graph and the knowledge about nesting interactions of these birds, identify which species (A, B, C) on the graph represents each type of bird.

Review the energy pyramid. Match the trophic level with the correct ecological term.

Organisms must use energy to grow, move, and perform other molecular functions. This decreases the efficiency of energy transfer from one organism to another.

As a result, organisms at the A level of the energy pyramid have the _________________ amount of energy available, and organisms at the D level of the energy pyramid have the ________________ amount of energy.