Organisms and Population Chapter-Wise Test 11

Correct answer Carries: 4.

Wrong Answer Carries: -1.

Which of the following is an adaptation to herbivory in plants?

Production of secondary metabolites
Increased seed dispersal
More efficient photosynthesis
Longer gestation periods
1

Plants produce secondary metabolites, such as toxins, to deter herbivores.

What happens when a population exceeds its carrying capacity?

Population growth increases exponentially
Resources become limited, leading to population decline
All individuals survive indefinitely
Birth rates increase
2

When a population exceeds carrying capacity, resource limitations lead to increased mortality and decreased reproduction.

Which factor is NOT considered in determining a species' ecological niche?

Its role in the ecosystem
Its interaction with other species
Its geographical location
Its tolerance to environmental conditions
3

A species' ecological niche is defined by its role, interactions, and environmental tolerances, but not strictly by its geographical location.

What is the primary reason why invasive species can outcompete native species?

They reproduce more slowly
They have fewer natural predators
They require specialized habitats
They depend on mutualistic interactions
2

Invasive species often thrive because they lack natural predators, allowing them to spread rapidly and outcompete native species.

Which of the following is an incorrect statement about ecosystem stability?

Higher biodiversity increases ecosystem resilience.
Stable ecosystems can recover from disturbances.
Ecosystem stability is unaffected by species interactions.
Ecosystem stability depends on biotic and abiotic factors.
3

Species interactions, such as predation and mutualism, play a critical role in maintaining ecosystem stability.

Which of the following is a correct statement about biodiversity?

Biodiversity includes species, genetic, and ecosystem diversity.
All ecosystems have the same level of biodiversity.
Biodiversity loss has no effect on ecosystem stability.
Biodiversity decreases ecosystem resilience.
1

Biodiversity encompasses species, genetic, and ecosystem diversity, contributing to ecosystem stability and resilience.

What is the primary advantage of resource partitioning among competing species?

It increases competition
It allows coexistence by reducing direct competition
It eliminates weaker species
It leads to extinction of all competing species
2

Resource partitioning reduces direct competition by allowing species to utilize different parts of a resource or habitat.

Which of the following statements about ecological interactions is correct?

Parasitism benefits both species involved.
Competition negatively affects both interacting species.
Mutualism always harms one species.
Predation does not affect prey populations.
2

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

Which of the following statements about ecological succession is correct?

Primary succession begins on previously inhabited land.
Secondary succession occurs faster than primary succession.
Pioneer species are the last to colonize during succession.
Succession does not lead to the formation of stable communities.
2

Secondary succession is faster because soil is already present, allowing plants to establish more quickly.

Which of the following correctly describes a J-shaped growth curve?

Population grows rapidly and stabilizes
Population grows exponentially and crashes when resources are depleted
Population remains constant over time
Population initially declines and then increases
2

A J-shaped growth curve represents exponential growth, where the population increases rapidly until resources become limited, leading to a crash.

Performance Summary

Score:

Category Details
Total Attempts:
Total Skipped:
Total Wrong Answers:
Total Correct Answers:
Time Taken:
Average Time Taken per Question:
Accuracy:
0