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Which of the following statements is correct?

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Wize University Biology Textbook > Ecology

Introduction to Ecology

5 Activities

Wize University Biology Textbook > Ecology

Species Interactions

4 Activities

Which of the following statements is correct?
More Introduction to Ecology Questions:
Which of the following explains why there are rarely more than five trophic levels in a food web?
Which of the following explains why there are rarely more than five trophic levels in a food web?
An organism that obtains energy and material from organic molecules is a:
In a forest community three species of rodents exists: mice, rats and voles. All three species eat the same types of nuts although they eat only what is appropriate for their size. A snake species that lives in this forest preys on all three rodents. One year, due to human intervention, the snake population is largely depleted and remains low for several years. Following this low species population there is an increase in the population of the rats while the voles and mice population decreases. What can be said about the snake in this ecosystem?
An example of a consumer is:
Which of the following regarding secondary consumers is most true?
An organism that obtains energy and material from organic molecules is a:
What is the ultimate source of energy for an ecosystem?
Which of the following is the best explanation as to why the net primary productivity in terrestrial ecosystems tend to increase towards the tropics?
Keystone species have profound effects on the structure and composition of an ecosystem because:
Which of the following does not cycle in an ecosystem?
True or False.
In an ecosystem, the initiation of energy flow is when a producer acquires inorganic nutrients from the environment.
True or False.
Biomass is calculated as the number of organisms multiplied by their weight.
Ecosystems are dependent on which fundamental pathways?
True or False.
Decomposers break down detritus.
An ecosystem possesses:
Which order of the following ecosystems is listed by an increase in primary productivity?
In a forest community three species of rodents exists: mice, rats and voles. All three species eat the same types of nuts although they eat only what is appropriate for their size. A snake species that lives in this forest preys on all three rodents. One year, due to human intervention, the snake population is largely depleted and remains low for several years. Following this low species population there is an increase in the population of the rats while the voles and mice population decreases.
What can be said about the snake in this ecosystem?
Which trophic level has the largest biomass?
Considering what you know about the average transfer of energy between trophic levels, what amount of energy would reach the third trophic level in the primary producers contain 500 units of energy.
You find that while the species can all be connected via different food chains that some of them eat “similar” organisms. Because of this you decide to organize a food map into more discrete groups.
What are these new groups?
Fungi are responsible for breaking down dead organic matter. In an ecosystem, they are called:
An example of a consumer is:
You are interested in understanding how an ecosystem functions with respects to the producers and consumers.
What sort of map should you construct?
Which of the following explains why there are rarely more than five trophic levels in a food web?
You are an ecologist trying to determine whether a population of rare sea lions will be able to grow and reproduce now that humans have invaded their habitat.
You know the following information:
the ambient temperature is consistently at 12 ̊C
The carrying capacity of an ecosystem is the same for all species that exist within it
You find that while the species can all be connected via different food chains that some of them eat "similar" organisms. Because of this you decide to organize the above map into more discrete groups. What are these new groups?
You are interested in understanding how an ecosystem functions with respects to the producers and consumers. What sort of map should you construct?
Which order of the following ecosystems is listed by an increase in primary productivity?
In a forest community three species of rodents exists: mice, rats and voles. All three species eat the same types of nuts although they eat only what is appropriate for their size. A snake species that lives in this forest preys on all three rodents. One year, due to human intervention, the snake population is largely depleted and remains low for several years. Following this low species population there is an increase in the population of the rats while the voles and mice population decreases. What can be said about the snake in this ecosystem?
Which trophic level has the largest biomass?
Which of the following explains why there are rarely more than five trophic levels in a food web?
Considering what you know about the average transfer of energy between trophic levels, what amount of energy would reach the third trophic level in the primary producers contain 500 units of energy.
Ecology Practice Problem 3
In a forest community three species of rodents exists: mice, rats and voles. All three species eat the same types of nuts although they eat only what is appropriate for their size. A snake species that lives in this forest preys on all three rodents. One year, due to human intervention, the snake population is largely depleted and remains low for several years. Following this low species population there is an increase in the population of the rats while the voles and mice population decreases. What can be said about the snake in this ecosystem?
Levels of Diversity
What is the difference between the following levels of organization?
Community and Ecosystem
Which of the following definitions is incorrect?
How do decomposers fit into the trophic level pyramid?
The least amount of useful energy flowing through a food chain is available to the:
Ecosystems are dependent on which fundamental pathways?
Decomposers break down detritus.
An example of a consumer is:
An ecosystem possesses:
More Species Interactions Questions:
Which of the following is NOT a density-dependent control that influences the black crow population size?
In a forest community three species of rodents exists: mice, rats and voles. All three species eat the same types of nuts although they eat only what is appropriate for their size. A snake species that lives in this forest preys on all three rodents. One year, due to human intervention, the snake population is largely depleted and remains low for several years. Following this low species population there is an increase in the population of the rats while the voles and mice population decreases. What can be said about the snake in this ecosystem?
Lichen attaches to trees and slowly breaks them down in order to obtain nutrients to increase their fitness. This is an example of what type of relationship?
a) Predatory
b) Mutualism
The symbiosis in which one species benefits and the other is always harmed is known as:
Which of the following terms describes a group of organisms of a single species that live in the same space, same time and reproduce with one another?
You are studying a population of ferrets with the following life table.
a) Fill in the missing data in the table.
b) The ferret population keeps increasing due to excess resources and lack of predators. To control this population there is a decision to prevent all ferrets from class 2-3 to mate or to sterilize all ferrets in class 3-4. Which of the above strategies will be more effective in slowing the population growth?
In a forest community three species of rodents exists: mice, rats and voles. All three species eat the same types of nuts although they eat only what is appropriate for their size. A snake species that lives in this forest preys on all three rodents. One year, due to human intervention, the snake population is largely depleted and remains low for several years. Following this low species population there is an increase in the population of the rats while the voles and mice population decreases.
What can be said about the snake in this ecosystem?
A mosquito taking blood from a human is an example of what type of relationship?
Sea anemones contain venom to paralyze their prey, but clownfish are resistant to this venom and so use the anemone as their niche.
This is an example of what type of relationship?
What prevents predator population from completely eliminating prey populations?
Lichen attaches to trees and slowly breaks them down in order to obtain nutrients to increase their fitness.
This is an example of what type of relationship?
Which of the following is NOT a density-dependent control that influences the black crow population size?
You are studying a population of ferrets with the following life table.
The ferret population keeps increasing due to excess resources and lack of predators. To control this population there is a decision to prevent all ferrets from class 2-3 to mate or to sterilize all ferrets in class 3-4.
Which of the above strategies will be more effective in slowing the population growth, option 1 or option 2?
What factors place limits on the logistic model of growth?
In a forest community three species of rodents exists: mice, rats and voles. All three species eat the same types of nuts although they eat only what is appropriate for their size. A snake species that lives in this forest preys on all three rodents. One year, due to human intervention, the snake population is largely depleted and remains low for several years. Following this low species population there is an increase in the population of the rats while the voles and mice population decreases. What can be said about the snake in this ecosystem?
What prevents predator population from completely eliminating prey populations?
Ecology Practice Problem 3
In a forest community three species of rodents exists: mice, rats and voles. All three species eat the same types of nuts although they eat only what is appropriate for their size. A snake species that lives in this forest preys on all three rodents. One year, due to human intervention, the snake population is largely depleted and remains low for several years. Following this low species population there is an increase in the population of the rats while the voles and mice population decreases. What can be said about the snake in this ecosystem?
Ecology Practice Problem 1
Lichen attaches to trees and slowly breaks them down in order to obtain nutrients to increase their fitness. This is an example of what type of relationship?
a) Predatory
b) Mutualism
It was found that guppies (live-bearing fish), when raised in predator free waters, produce larger sized offspring that mature slowly.
This is in comparison to guppies raised in the presence of predators whereby the progeny are smaller, mature quicker and reproduce earlier.
What phenomena is occurring?
The species interaction in which one species benefits and the other is always harmed is known as which of the following? Choose all that apply.
What is a symbiotic relationship?
Sea anemones contain venom to paralyze their prey, but clownfish are resistant to this venom and so use the anemone as their niche. This is an example of what type of relationship?
Consider a species of forest flower that varies in colour from white to pink to bright red. Aphids prefer to eat the coloured flowers over the white ones, and pollinators prefer this colour as well (therefore have better reproductive success). The percentage of different flower colours remains stable from year to year, however if all aphids are removed what would you expect to happen in the distribution of flower colours?
Practice: Frog Evolution Scenario
Consider the following scenario. Answer all questions using key terminologies and justifications.
A tropical rainforest supports a species of poison dart frog which feeds primarily on a local tree beetle. Providing the weather is constant, and food is plentiful, this species continues to breed and populate the ecosystem. Further, the ratio of males and females is equal so no competitive mating is occurring and the entire species is phenotypically identical.
a) Providing the above situation is maintained, will these species evolve in the next 1000 years? Justify your answer.
As the population of black crows increases in January, which of the following is true?
A mosquito taking blood from a human is an example of what type of relationship?
Sea anemones contain venom to paralyze their prey, but clownfish are resistant to this venom and so use the anemone as their niche. This is an example of what type of relationship?