Ecosystems CFA 2023

Where is the largest amount of energy found in this food web?

• Grass

• Grasshopper

• Mouse

• Hawk

How would an increasing shark population most likely affect this ecosystem?

• The algae population would decrease

• The octopus population would decrease.

• The seagull population would decrease.

• The limpet population would decrease.

Which BEST describes the exchange of energy between the organisms?

• Each organism obtains energy from the environment.

• Each organism obtains energy by eating other organisms.

• One organism obtains energy from the environment, while the others obtain energy by eating other organisms.

• One organism obtains energy by eating other organisms, while the others obtain energy from the environment

Misteltoe is a green plant that can make its own food, but it also takes food from the Mesquite Tree that the Mistletoe lives on. By doing this the Misteltoe is able to steal water and valuable nutrients from the Mesquite Tree. What kind of relationship do these organisms represent?

• Mutualism

• Commensalism

• Parasitism

• Survival of the Fittest

Which represents a short-term storage for carbon?

• Carbohydrates stored in fruits and vegetables.

• Limestone rocks quarried at Earth's surface.

• Coal formed from plants that lived long ago.

• Coral reefs formed from calcium carbonate.

In the ocean, a sea anemone attaches itself to the shell of a hermit crab. The stinging arms of the sea anemone protect the hermit crab, while the movement of the hermit crab brings food to the sea anemone. Which best describes the relationship between the sea anemone and the hermit crab?

• Mutualism

• Commensalism

• Parasitism

Matter cycles between the environment and living organisms in a complex web of interactions. Which organisms provide the important link from dead organic matter to matter from the environment?

• Autotrophs

• Decomposers

• Parasites

• Photosynthesizers

The diagram shows ecological relationships in an African savanna environment. What happens to the amount of energy available to organisms when moving from trophic level 1 to trophic level 2?

• Energy decreases by approximately 90%

• Energy increases by approximately 90%

• Energy decreases by approximately

  10%

• Energy increases by approximately 10%

Meadows are grassland areas, usually low-lying with moist soil. Meadows support a rich variety of animal life. A food web for a meadow is shown. The removal of which populations of organisms would have the GREATEST impact on the food web?

• Snakes

• Rabbits

• Seed-eating birds

• Grasses and Shrubs

Within a cave environment, bat waste products, called guano, are decomposed by organisms such as fungi and bacteria. These are then eaten by creatures such as flatworms. Larger animals like salamanders eat flatworms. Which correctly represents the energy flow described?

• Guano → Bacteria → Flatworms → Salamanders

• Fungi → Bacteria → Salamanders → Guano

• Bats → Guano → Flatworms → Salamanders

• Salamanders → Fungi → Bacteria → Flatworms