Ecology and Trophic Levels Quiz

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What is an autotroph?

An organism that produces its own food using sunlight or inorganic compounds (correct)

An organism that obtains energy from consuming other organisms

An organism that feeds on dead organic matter

An organism that relies on other organisms for food

What is a heterotroph?

An organism that relies on other organisms for food

An organism that feeds on dead organic matter

An organism that obtains energy from consuming other organisms (correct)

An organism that produces its own food using sunlight or inorganic compounds

What would happen to the grasshopper population if the sparrow were to die off due to a disease?

The grasshopper population would increase due to less predation (correct)

The grasshopper population would remain unaffected

The grasshopper population would become extinct

The grasshopper population would decrease due to increased competition for food

What percentage of energy is typically transferred to the next trophic level?

10% Signup and view all the answers

What do you think would happen to your food web if the producers died out because of pollution? Is this top-down control or bottom-up control?

The entire food web would collapse due to lack of energy input, this is top-down control Signup and view all the answers

Which species in the food web above are the primary consumers?

Rabbits - because they feed on grass Signup and view all the answers

What effect would an increase in the Great Horned Owl population have on the grasshopper population?

The grasshopper population would decrease due to predation by the owls. Signup and view all the answers

How would the rabbit population be impacted if the hawk were to be removed from the food web?

The rabbit population would increase due to reduced predation pressure from the hawk. Signup and view all the answers

What would happen to the grasshopper population if the sparrow were to die off due to a disease?

The grasshopper population would decrease due to increased predation by other predators. Signup and view all the answers

If the Great Horned Owl or Hawk population were to double, what type of control would this represent in the food web?

Top-down control Signup and view all the answers

What do you think would happen to the food web if the producers died out because of pollution?

The entire food web would collapse due to lack of energy input. Signup and view all the answers

What percentage of energy is typically transferred to the next trophic level in a food web?

10% Signup and view all the answers

What are four specific biotic factors in a tundra ecosystem?

Possible answers: Caribou, Arctic fox, lichen, moss Signup and view all the answers

Describe the domino effect that a consumer has if it is removed from the ecosystem.

The population of the consumer's prey may increase, affecting the availability of food for other consumers. Signup and view all the answers

Looking at the picture above, what happens to the cownose ray’s population when the shark is removed? Why.

The cownose ray population may increase because its predator is removed, leading to less predation pressure. Signup and view all the answers

What is an introduced species?

An introduced species is a non-native species deliberately or accidentally introduced to a new location. Signup and view all the answers

Describe the four factors that affect population size.

The four factors are birth rate, death rate, immigration, and emigration. Signup and view all the answers

What is the difference between immigration and emigration?

Immigration refers to individuals moving into a population from another area, while emigration refers to individuals moving out of a population to another area. Signup and view all the answers

If the birth rate is 7, the death rate is 2, the immigration rate is 1, and the emigration rate is 6, is the population increasing or decreasing? How do you know? Show your work using the equation above.

The population is decreasing. This can be determined by calculating (7 + 1) - (2 + 6) = 0, which indicates zero population growth. Signup and view all the answers

What does it mean when the population growth is zero?

When the population growth is zero, it means that the birth rate and immigration rate are equal to the death rate and emigration rate, resulting in no net change in the population size. Signup and view all the answers

Describe the difference between density dependent and density independent factors.

Density dependent factors are influenced by the population size, such as competition for resources, while density independent factors, like natural disasters, affect populations regardless of their size. Signup and view all the answers

Describe the difference between intraspecific and interspecific competition.

Intraspecific competition occurs between individuals of the same species, while interspecific competition occurs between individuals of different species. Signup and view all the answers

Using your knowledge of populations, explain why the wolf and the rabbit population fluctuate over time. Be sure to include the term carrying capacity in your answer.

The fluctuations in wolf and rabbit populations are influenced by factors such as predation, competition for resources, and the carrying capacity of the environment. As the rabbit population increases, it provides more food for the wolves, leading to an increase in the wolf population. However, as the wolf population grows, it puts pressure on the rabbit population, causing it to decrease. This cycle continues, leading to fluctuations in both populations around the carrying capacity of their environment. Signup and view all the answers

Ecology and Trophic Levels Quiz

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Questions and Answers

What is an autotroph?

What is a heterotroph?

What would happen to the grasshopper population if the sparrow were to die off due to a disease?

What percentage of energy is typically transferred to the next trophic level?

What do you think would happen to your food web if the producers died out because of pollution? Is this top-down control or bottom-up control?

Which species in the food web above are the primary consumers?

What effect would an increase in the Great Horned Owl population have on the grasshopper population?

How would the rabbit population be impacted if the hawk were to be removed from the food web?

What would happen to the grasshopper population if the sparrow were to die off due to a disease?

If the Great Horned Owl or Hawk population were to double, what type of control would this represent in the food web?

What do you think would happen to the food web if the producers died out because of pollution?

What percentage of energy is typically transferred to the next trophic level in a food web?

What are four specific biotic factors in a tundra ecosystem?

Describe the domino effect that a consumer has if it is removed from the ecosystem.

Looking at the picture above, what happens to the cownose ray’s population when the shark is removed? Why.

What is an introduced species?

Describe the four factors that affect population size.

What is the difference between immigration and emigration?

If the birth rate is 7, the death rate is 2, the immigration rate is 1, and the emigration rate is 6, is the population increasing or decreasing? How do you know? Show your work using the equation above.

What does it mean when the population growth is zero?

Describe the difference between density dependent and density independent factors.

Describe the difference between intraspecific and interspecific competition.

Using your knowledge of populations, explain why the wolf and the rabbit population fluctuate over time. Be sure to include the term carrying capacity in your answer.

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