Organisms and Population Chapter-Wise Test 13

Correct answer Carries: 4.

Wrong Answer Carries: -1.

Which of the following represents an example of a keystone species?

Bamboo in a forest
Tiger in a grassland ecosystem
Rabbit in a field
Pine tree in a coniferous forest
2

Keystone species, such as tigers, play a crucial role in maintaining ecosystem balance by controlling prey populations.

Which of the following best describes resource partitioning?

Two species completely overlap in resource use
One species outcompetes the other, leading to extinction
Species use different parts of a resource to reduce competition
A predator preying on different species
3

Resource partitioning allows species to coexist by utilizing different parts of a resource, reducing direct competition.

Which of the following is an example of a density-independent factor regulating population size?

Predation
Food availability
Disease
Natural disaster
4

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

Which of the following best defines the term "age structure" in population ecology?

The proportion of males and females in a population
The relative number of individuals in different age groups
The total number of individuals in a population
The rate of population increase over time
2

Age structure refers to the relative proportion of individuals in different age groups within a population.

Which of the following species interactions results in both species being harmed?

Mutualism
Commensalism
Parasitism
Competition
4

Competition occurs when two species compete for limited resources, negatively affecting both.

Which of the following statements about keystone species is incorrect?

Keystone species play a crucial role in ecosystem balance.
Removing a keystone species can disrupt an ecosystem.
Keystone species are always the most abundant in an ecosystem.
Predators can act as keystone species by regulating prey populations.
3

Keystone species are not necessarily the most abundant, but their presence significantly affects ecosystem structure and function.

Which of the following best defines the carrying capacity (K) of an environment?

The maximum number of species an ecosystem can support
The highest population size that an environment can sustain indefinitely
The total number of individuals born in a year
The total number of species in an ecosystem
2

Carrying capacity (K) is the maximum population size that an environment can support based on resource availability.

Which of the following statements about trophic levels is incorrect?

Producers occupy the first trophic level.
Primary consumers feed directly on producers.
Tertiary consumers obtain energy directly from producers.
Decomposers play a role in nutrient cycling.
3

Tertiary consumers do not obtain energy directly from producers; they consume primary and secondary consumers.

Which of the following is a correct statement about trophic levels?

Producers occupy the highest trophic level.
Primary consumers feed directly on producers.
Energy transfer between trophic levels is 100% efficient.
Decomposers do not play a role in energy transfer.
2

Primary consumers, such as herbivores, obtain energy by consuming producers (plants and algae).

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

Ecosystem resilience refers to the ability to recover from disturbances.
Resilience decreases with higher biodiversity.
Resilient ecosystems are always unstable.
Human activities have no impact on ecosystem resilience.
1

Ecological resilience is the ability of an ecosystem to recover from disturbances and maintain its functions.

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