Unit 9 Target 2: Habitat, Niche, And Resources

2.

Competitive exclusion occurs whena. a species is eliminated from a community because of competition. b. new species enter an ecosystem because one of the original species died off. c. species reproduce in increasing numbers because more food is available. d. All of the above

Option 1
Option 2
Option 3
Option 4

Correct Answer

A. Option 1

Explanation

Competitive exclusion occurs when a species is eliminated from a community because of competition. This means that when two or more species compete for the same limited resources, the species that is better adapted or more efficient at utilizing those resources will outcompete and eventually eliminate the other species from the community. This leads to a decrease in biodiversity as only the dominant species survives and thrives.

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3.

The specific physical location in which a given species lives is called itsa. habitat. c. community. b. abiotic factor. d. climate.

Option 1
Option 2
Option 3
Option 4

Correct Answer

A. Option 1

Explanation

The specific physical location in which a given species lives is called its habitat. This refers to the natural environment or home of a particular organism, where it can find the necessary resources, such as food, water, and shelter, to survive and reproduce. A habitat can vary greatly depending on the species and can include forests, deserts, oceans, or even urban areas. Understanding a species' habitat is crucial for conservation efforts and managing ecosystems.

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4.

Which of the following is a density-independent limiting factor?a. food c. severe weather b. water d. number of nesting sites

Option 1
Option 2
Option 3
Option 4

Correct Answer

A. Option 3

Explanation

Density-independent limiting factors are factors that affect a population regardless of its size or density. Severe weather is a density-independent limiting factor because it can impact a population regardless of how many individuals there are. It can cause destruction of habitats, food scarcity, and even death, which can affect the population size and growth. Therefore, severe weather is a density-independent limiting factor.

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5.

An organism’s niche isa. the range of physical and biological conditions in which an organism lives and the way in which it uses those conditions. b. all the physical and biological factors in the organism’s environment c. the range of temperatures that the organism needs to survive. d. a full description of the place an organism lives.

Option 1
Option 2
Option 3
Option 4

Correct Answer

A. Option 1

Explanation

An organism's niche refers to the range of physical and biological conditions in which it lives and how it utilizes those conditions. This includes factors such as temperature, availability of resources, interactions with other organisms, and other environmental factors. It is not limited to just the physical and biological factors in the organism's environment or the range of temperatures it requires to survive. Option 1 accurately describes the concept of an organism's niche.

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6.

A biotic or an abiotic resource in the environment that causes population size to decrease is a a. growth factor. c. limiting nutrient. b. carrying capacity. d. limiting factor.

Option 1
Option 2
Option 3
Option 4

Correct Answer

A. Option 4

Explanation

A biotic or an abiotic resource in the environment that causes population size to decrease is called a limiting factor. This refers to any factor that restricts the growth, abundance, or distribution of a population within an ecosystem. Limiting factors can include factors such as food availability, predation, disease, competition for resources, and environmental conditions. These factors can prevent a population from reaching its maximum potential size and can ultimately lead to a decrease in population size.

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7.

Each of the following is a density-independent limiting factor EXCEPTa. natural disasters. c. seasonal cycles. b. availability of water. d. human activity.

Option 1
Option 2
Option 3
Option 4

Correct Answer

A. Option 2

Explanation

Natural disasters, seasonal cycles, availability of water, and human activity are all examples of density-independent limiting factors. These factors affect populations regardless of their density or size. Density-independent limiting factors are typically external factors that can have a significant impact on population size and growth. Option 2 is the correct answer because it is the only option that is not a density-independent limiting factor.

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8.

Which would be LEAST likely to be affected by a density-dependent limiting factor?a. a small, scattered population c. a population with a high birthrate b. a population with high immigration rate d. a large, dense population

Option 1
Option 2
Option 3
Option 4

Correct Answer

A. Option 1

Explanation

A small, scattered population would be least likely to be affected by a density-dependent limiting factor because the individuals in the population are spread out and have more space and resources available to them. Density-dependent limiting factors, such as competition for resources and increased risk of disease transmission, are more likely to occur in populations that are large and dense, where individuals are in close proximity to each other and resources are limited. In contrast, a small, scattered population would have less competition for resources and a lower risk of disease transmission, making them less susceptible to density-dependent limiting factors.

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9.

Which of the following is a renewable resource?a. biodiversity c. oil b. water d. coal

Option 1
Option 2
Option 3
Option 4

Correct Answer

A. Option 2

Explanation

Biodiversity is a renewable resource because it refers to the variety of life forms on Earth, including plants, animals, and microorganisms. Biodiversity can be sustained and replenished through natural processes such as reproduction, regeneration, and evolution. Unlike non-renewable resources like oil and coal, which are finite and take millions of years to form, biodiversity can be conserved and managed to ensure its long-term availability for future generations. Water is also considered a renewable resource as it is continuously replenished through the water cycle.

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10.

Different species can share the same habitate, but competition among them is reduced if theya. reproduce at different times. c. increase their populations. b. eat less. d. occupy different niches.

Option 1
Option 2
Option 3
Option 4

Correct Answer

A. Option 4

Explanation

Different species can share the same habitat, but competition among them is reduced if they occupy different niches. This means that each species has its own specific role or position within the ecosystem, utilizing different resources or occupying different parts of the habitat. By occupying different niches, the species can coexist without directly competing for the same resources, reducing competition and promoting biodiversity within the habitat.

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11.

No two species can occupy the same nich in the same habitat at the same timea. because of the interactions that shape the ecosystem. b. because of the competitive exclusion principle. c. unless the species require different biotic factors. d. unless the species require different abiotic factors.

Option 1
Option 2
Option 3
Option 4

Correct Answer

A. Option 2

Explanation

No two species can occupy the same niche in the same habitat at the same time because of the competitive exclusion principle. This principle states that two species competing for the same limited resources cannot coexist indefinitely, and one species will eventually outcompete and exclude the other. This is because resources such as food, space, and mates are limited, and any advantage one species has over the other will lead to its dominance in the niche. Therefore, in order to avoid competition and ensure their survival, species must occupy different niches or habitats.

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12.

A biologist recorded the number of rabbits in a population over 30 generations. Which of the following statements best explains why the number of rabbits in the population dramatically devreased between Points A and B?Shortly after the 10th generation:a. a new predator that feeds solely on the rabbits’ main competitor was introduced into the rabbits’ habitat. b. area farmers set traps for coyotes, the rabbits’ main predator. c. a change in environmental conditions led to a significant increase in the amount of food available to the rabbits. d. a fatal disease infected a large proportion of the rabbits in this population.

Option 1
Option 2
Option 3
Option 4

Correct Answer

A. Option 4

Explanation

Shortly after the 10th generation, a fatal disease infected a large proportion of the rabbits in this population. This best explains why the number of rabbits in the population dramatically decreased between Points A and B.

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Unit 9 Target 2: Habitat, Niche, And Resources

Which of the following would not be included in a description of an organism’s niche?a. its trophic level b. the humidity and temperature it prefers c. its number of chromosomes d. when it reproduces

Quiz Preview

Competitive exclusion occurs whena. a species is eliminated from a community because of competition. b. new species enter an ecosystem because one of the original species died off. c. species reproduce in increasing numbers because more food is available. d. All of the above

The specific physical location in which a given species lives is called itsa. habitat. c. community. b. abiotic factor. d. climate.

Which of the following is a density-independent limiting factor?a. food c. severe weather b. water d. number of nesting sites

A biotic or an abiotic resource in the environment that causes population size to decrease is a a. growth factor. c. limiting nutrient. b. carrying capacity. d. limiting factor.

Each of the following is a density-independent limiting factor EXCEPTa. natural disasters. c. seasonal cycles. b. availability of water. d. human activity.

Which would be LEAST likely to be affected by a density-dependent limiting factor?a. a small, scattered population c. a population with a high birthrate b. a population with high immigration rate d. a large, dense population

Which of the following is a renewable resource?a. biodiversity c. oil b. water d. coal

Different species can share the same habitate, but competition among them is reduced if theya. reproduce at different times. c. increase their populations. b. eat less. d. occupy different niches.

No two species can occupy the same nich in the same habitat at the same timea. because of the interactions that shape the ecosystem. b. because of the competitive exclusion principle. c. unless the species require different biotic factors. d. unless the species require different abiotic factors.