Organisms and Population Chapter-Wise Test 9

Correct answer Carries: 4.

Wrong Answer Carries: -1.

Which of the following statements about population growth is correct?

Exponential growth occurs when resources are unlimited.
Logistic growth does not consider carrying capacity.
Birth and death rates do not affect population size.
Environmental resistance has no impact on population growth.
1

Exponential growth occurs when resources are abundant, allowing populations to grow without limits.

Which of the following interactions occurs when one species benefits and the other remains unaffected?

Parasitism
Mutualism
Commensalism
Competition
3

In commensalism, one species benefits while the other is neither helped nor harmed, such as barnacles on a whale.

Which of the following statements about ecological pyramids is incorrect?

Pyramids of energy are always upright.
Pyramids of biomass can sometimes be inverted.
Pyramids of numbers always have a larger base than upper levels.
Ecological pyramids show the flow of energy and biomass in ecosystems.
3

Pyramids of numbers can be inverted in certain ecosystems, such as in forests where a few large trees support many consumers.

Which of the following is a correct statement about ecosystem resilience?

Ecosystem resilience refers to the ability to recover from disturbances.
Resilient ecosystems are always fragile.
Biodiversity has no effect on resilience.
Resilience decreases when species interactions are strong.
1

Ecological resilience refers to an ecosystem's ability to recover from disturbances while maintaining function and stability.

Which type of competition occurs between individuals of the same species?

Interspecific competition
Intraspecific competition
Mutualism
Commensalism
2

Intraspecific competition occurs among individuals of the same species competing for limited resources.

What happens when a population reaches carrying capacity?

Population growth stops or stabilizes
Population growth accelerates
Resources become unlimited
Birth rate increases indefinitely
1

When a population reaches carrying capacity, growth slows due to limited resources and increased competition.

Which factor is most responsible for fluctuations in population size?

Climate change
Availability of food and resources
Genetic mutations
Individual adaptations
2

Availability of food and resources directly affects population size by influencing birth and death rates.

Which of the following best describes Gause’s Competitive Exclusion Principle?

Two species can occupy the same niche indefinitely
Two species competing for the same resources cannot coexist indefinitely
Species always evolve to avoid competition
Predation prevents competition among species
2

Gause’s Competitive Exclusion Principle states that two species competing for the same resources cannot coexist indefinitely; one will outcompete the other.

Which of the following statements about the greenhouse effect is correct?

Greenhouse gases absorb and trap heat in the atmosphere.
Carbon dioxide is not a greenhouse gas.
The greenhouse effect has no impact on global temperatures.
Greenhouse gases decrease heat retention on Earth.
1

Greenhouse gases like CO₂ and methane trap heat in the Earth's atmosphere, contributing to global warming.

Which population interaction is responsible for the success of biological control programs?

Mutualism
Parasitism
Predation
Competition
3

Biological control relies on predation, where natural predators control pest populations.

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