Organisms and Population Chapter-Wise Test 25

Correct answer Carries: 4.

Wrong Answer Carries: -1.

Which of the following is an incorrect statement about species interactions?

Mutualism benefits both species involved.
Parasitism benefits one species while harming the other.
Commensalism benefits one species without affecting the other.
Competition always benefits both species.
4

Competition negatively affects both species as they compete for the same limited resources.

Which of the following best describes an ecosystem's resilience?

The number of species in the ecosystem
The ability of an ecosystem to recover from disturbances
The stability of predator-prey relationships
The ability of an ecosystem to support only K-selected species
2

Ecosystem resilience refers to the ability of an ecosystem to recover after disturbances and maintain its function.

In a logistic growth curve, what happens as population size (N) approaches carrying capacity (K)?

Population growth increases exponentially
Population growth slows down
Death rate decreases to zero
Natality rate increases
2

As population size nears carrying capacity (K), competition increases and growth slows due to limited resources.

Which of the following is a fundamental concept of population ecology?

Only abiotic factors influence populations
Populations remain constant over time
Populations interact with biotic and abiotic factors
Individuals adapt to environmental changes, but populations do not
3

Population ecology studies how populations interact with both biotic (living) and abiotic (non-living) environmental factors.

Which of the following statements about invasive species is true?

They always increase biodiversity
They can outcompete native species and disrupt ecosystems
They are always beneficial to the ecosystem
They are only found in aquatic environments
2

Invasive species can outcompete native species, leading to reduced biodiversity and ecosystem imbalance.

Which of the following statements about species interactions is correct?

Mutualism benefits both interacting species.
Commensalism always harms one species.
Parasitism benefits both species equally.
Competition results in increased resources for both species.
1

Mutualism is an interaction in which both species benefit, such as pollination.

Which of the following is a density-independent factor affecting population size?

Food availability
Predation pressure
Natural disasters
Disease
3

Natural disasters like floods and earthquakes affect populations regardless of their density, making them density-independent factors.

Which of the following describes an invasive species?

A species that is native to an ecosystem
A species introduced to a new habitat that spreads uncontrollably
A species that only grows in controlled environments
A species that has co-evolved with its habitat
2

An invasive species is one that is introduced into a new habitat and spreads aggressively, often harming native species.

Which of the following species interactions is beneficial to both species involved?

Parasitism
Commensalism
Mutualism
Amensalism
3

In mutualism, both species benefit from their interaction, as seen in pollinators and flowering plants.

Which of the following is a characteristic of an organism following an r-selected reproductive strategy?

Long lifespan
Few offspring with high parental care
Rapid reproduction with minimal parental care
Slow development and stable population size
3

r-selected species reproduce rapidly, produce many offspring, and provide little or no parental care.

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