- What is the term used to describe a species’ role in its environment, including how it gets its food and interacts with other species?
A) Habitat
B) Niche
C) Territory
D) Ecosystem
Answer: B) Niche
Explanation:
A niche refers to the role and space an organism occupies in its environment, including its interactions with other organisms and its use of resources.
- A group of individuals of the same species living in the same area at the same time is called:
A) Community
B) Population
C) Ecosystem
D) Biome
Answer: B) Population
Explanation:
A population is defined as a group of individuals of the same species that live in the same area and can interbreed.
- Which of the following best describes a r-strategist species?
A) Produces few offspring but invests heavily in parental care.
B) Lives in stable environments and produces fewer offspring.
C) Reproduces early, produces many offspring, and has little parental care.
D) Has a long lifespan and low reproductive rate.
Answer: C) Reproduces early, produces many offspring, and has little parental care.
Explanation:
R-strategists are organisms that reproduce quickly and in large numbers, with little to no parental care. They are typically adapted to unstable environments.
- The density-dependent factors that limit population growth include:
A) Weather
B) Temperature
C) Competition
D) Natural disasters
Answer: C) Competition
Explanation:
Density-dependent factors, like competition, disease, and predation, become more intense as population density increases and affect the growth of populations.
- What is an example of a keystone species?
A) A predator that helps maintain the balance of the ecosystem by controlling prey populations.
B) A species that reproduces quickly and has many offspring.
C) A species that exists at the top of the food chain without any natural predators.
D) A species that has little impact on the ecosystem.
Answer: A) A predator that helps maintain the balance of the ecosystem by controlling prey populations.
Explanation:
Keystone species play a critical role in maintaining the structure of an ecosystem. For example, sea otters control sea urchin populations, which helps maintain kelp forest ecosystems.
- Which of the following can increase the size of a population?
A) Immigration
B) Emigration
C) Death rate higher than birth rate
D) None of the above
Answer: A) Immigration
Explanation:
Immigration increases population size by adding individuals from outside the population, whereas emigration and high death rates would decrease population size.
- What type of population growth occurs when a population’s growth slows down and stabilizes after reaching its carrying capacity?
A) Exponential growth
B) Logistic growth
C) Cyclic growth
D) Boom-and-bust growth
Answer: B) Logistic growth
Explanation:
Logistic growth occurs when population growth slows and stabilizes near the environment’s carrying capacity due to limited resources.
- Which of the following is true about the concept of “overpopulation”?
A) It occurs when a population exceeds the carrying capacity of its environment.
B) It refers to an organism’s ability to reproduce.
C) It occurs only in species that reproduce slowly.
D) It has no impact on the environment.
Answer: A) It occurs when a population exceeds the carrying capacity of its environment.
Explanation:
Overpopulation occurs when the number of individuals in a population exceeds the resources and space available in an environment, leading to environmental degradation and resource depletion.
- In which of the following scenarios would you expect a population to experience exponential growth?
A) When the population is near its carrying capacity.
B) When resources are abundant and there are no limiting factors.
C) When there is a high rate of predation.
D) When disease spreads rapidly among the population.
Answer: B) When resources are abundant and there are no limiting factors.
Explanation:
Exponential growth occurs when there are no limiting factors such as food, space, or predators, allowing a population to grow rapidly.
- What is the effect of competition on population growth?
A) It decreases population size.
B) It has no effect on population size.
C) It increases population size.
D) It increases reproductive rates.
Answer: A) It decreases population size.
Explanation:
Competition for resources such as food, space, or mates can limit population growth by reducing the survival and reproduction rates of individuals.
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