ECOLOGICAL RELATIONSHIPS

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Period One

Period Two

Period Four

Period Five

Period Six

Period Seven

Period Eight

Teacher *

Ms. Lewis

Mr. Laws

1. How do plankton at the surface of the ocean and bacteria at a hydrothermal vent differ in the way they obtain energy? *

20 points

Plankton use predators and bacteria use prey.

Plankton use parasites and bacteria use hosts

Plankton use herbivores and bacteria use carnivores

Plankton use sunlight and bacteria use chemicals in seawater

2. The diagram shows an aquatic ecosystem. Which of the following would be an investigation into how an organism in this ecosystem depends on an abiotic factor? *

20 points

a study of fish eating algae

a study of fish swimming in water

a study of fish mating with another fish

a study of fish seeking shelter behind a plant

3. The graph below shows the pH tolerance level for different organisms in a freshwater ecosystem.What would most likely happen if the pH of the pond water dropped from 5.5 to 3.5? (Hint: Step 1. Analyze the pH tolerance of the organisms in the pond ecosystem. Step 2. Determine which organisms would be affected by a drop in pH level.) *

20 points

The populations of all organisms would increase.

The populations of most organisms would decrease.

The populations of most organisms would not change.

The populations of one or two organisms would decrease.

4. The graph shows changes in the populations of predator and prey over time.Which best explains why the population of prey increased near the end of the timeline shown on the graph?

20 points

Fewer prey were reproducing.

More predators moved into the area.

Fewer predators were hunting the prey.

More prey were competing for resources

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5. The diagram below shows a mangrove swamp food web.Molds are consumed by some organisms. They are also decomposers in ecosystems. How would this food web change to show the role of mold as decomposers? (Hint: Step 1. Recall how the flow of energy is shown in a food web. Step 2. Recall how decomposers get their energy. Step 3. Use this information to determine how to illustrate the flow of energy to a decomposer.) *

20 points

If the small fish died, an arrow would point from the small fish to the mold.

If the snail population increased, the arrow between the mold and the snail would be reversed.

If the bacteria population increased, an arrow would be added between the bacteria and the mold.

If the mangrove leaves died, the arrow between the mold and the mangrove leaves would be erased.

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