Ecology Quiz Review

Two carnivores in the food web are

• bass and small invertebrates

• water plants and clams

• small invertebrates and crabs

• crabs and crayfish

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Which group of organisms in an ecosystem

fills the niche of recycling organic matter back to the environment?

• carnivores

• decomposers

• producers

• predators

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If the fish population decreases, what is the most direct

effect this will have on the aquatic ecosystem?

• The leopard seals will all die from lack of food.

• The krill population will only be consumed by seagulls.

• The zooplankton population will increase in size.

• The phytoplankton population will increase in size.

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In this pyramid, the greatest amount of energy is found at level

• A

• B

• C

• D

As it grows from a seed to a mature plant, a plant will grow taller and thicker. Which are abiotic factors most responsible for the increase in the mass of the plant?

• water, minerals, bacteria

• sunlight, oxygen, plant receptors

• minerals, water, plant enzymes

• water, sunlight, carbon dioxide

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Which stage of the ecosystem has the greatest long-term stability?

• A

• B

• C

• D

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Deforestation most directly results in

• an increase in oxygen in the atmosphere

• a decrease in biodiversity in the area

• a decrease in soil erosion

• an increase in the absorption of carbon dioxide

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State one reason for the changes in population size represented by line A between years 5 and 10.

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Predict what would happen to the soil and vegetation of this ecosystem after stage F, assuming no natural disaster or human interference.

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