Organisms and Population Chapter-Wise Test 18

Correct answer Carries: 4.

Wrong Answer Carries: -1.

What happens when a population exceeds its carrying capacity?

Population growth accelerates
Resources become limited, leading to competition
Birth rates increase significantly
All individuals survive indefinitely
2

When a population exceeds carrying capacity, resources become limited, leading to increased competition and mortality.

Which of the following population attributes determines the potential for future population growth?

Age distribution
Mortality rate
Carrying capacity
Species richness
1

Age distribution helps predict future population growth by showing the proportion of individuals in reproductive and pre-reproductive stages.

Which of the following statements about resource partitioning is incorrect?

It helps reduce competition among species.
It leads to species using different resources or habitats.
It prevents coexistence among competing species.
It allows species to exploit available resources more efficiently.
3

Resource partitioning promotes coexistence by reducing direct competition, not preventing it.

Which factor is most likely to regulate a population size in a density-dependent manner?

Hurricane
Disease
Earthquake
Volcanic eruption
2

Density-dependent factors, such as disease, increase in effect as population density rises.

Which of the following statements about population dynamics is incorrect?

Birth rate and death rate influence population size.
Immigration increases population size.
Carrying capacity remains constant under all environmental conditions.
Predation can regulate population size.
3

Carrying capacity is not constant; it varies based on environmental conditions and resource availability.

What is the significance of predation in an ecosystem?

It leads to extinction of prey species
It controls prey populations and maintains ecosystem stability
It reduces species diversity
It prevents energy transfer in the food chain
2

Predation helps regulate prey populations and maintain ecological balance, preventing overpopulation.

Which of the following statements about the phosphorus cycle is correct?

The phosphorus cycle includes an atmospheric component.
Phosphorus is primarily cycled through rock weathering and soil processes.
Phosphorus does not play a role in biological systems.
The phosphorus cycle does not involve any geological processes.
2

Phosphorus is released into ecosystems through rock weathering and is a key nutrient for biological processes.

Which of the following statements about logistic growth is FALSE?

It includes a carrying capacity
Growth rate is highest when the population is small
It shows an S-shaped curve
Population grows indefinitely
4

Logistic growth is limited by carrying capacity, preventing indefinite population growth.

Which of the following best describes the term "competitive exclusion principle"?

Two species can coexist indefinitely in the same niche
Two closely related species cannot coexist in the same niche indefinitely
Competition always results in extinction
Herbivory is a type of competition
2

The competitive exclusion principle states that two species competing for the same resources cannot coexist indefinitely.

Which of the following statements about population dynamics is correct?

Birth rate and death rate influence population size.
Immigration decreases population size.
Carrying capacity remains constant in all environmental conditions.
Predation has no effect on population size.
1

Birth rate and death rate are key factors that regulate population growth and size.

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