Organisms and Population Chapter-Wise Test 17

Correct answer Carries: 4.

Wrong Answer Carries: -1.

What does a bell-shaped age pyramid indicate?

Expanding population
Declining population
Stable population
Extinct population
3

A bell-shaped age pyramid indicates a stable population, where birth and death rates are balanced.

Which of the following is an example of a density-independent factor affecting population growth?

Food availability
Predation
Hurricane
Parasitism
3

Hurricanes and other natural disasters affect populations regardless of their density, making them density-independent factors.

Which of the following statements about keystone species is incorrect?

Keystone species have a disproportionate impact on ecosystem stability.
Their removal can cause major disruptions in the ecosystem.
They are always the most abundant species in an ecosystem.
Some predators act as keystone species by controlling prey populations.
3

Keystone species are not necessarily the most abundant, but they play a crucial role in maintaining ecosystem structure.

Which of the following is a correct statement about ecological niches?

A niche includes only the physical habitat of an organism.
Fundamental and realized niches are always the same.
A species' niche includes its role and interactions in an ecosystem.
Niches do not influence species competition.
3

A species' ecological niche includes its habitat, role in the ecosystem, and interactions with other organisms.

Which of the following best describes an example of Batesian mimicry?

A non-toxic butterfly resembling a toxic butterfly
Two toxic frog species looking similar
A chameleon changing color to blend into its environment
A lizard dropping its tail to escape predators
1

Batesian mimicry occurs when a harmless species mimics a harmful one to avoid predation.

Which population attribute is unique to a population but not to an individual?

Birth and death
Reproduction
Age
Sex ratio
4

Sex ratio is an attribute of populations, not individuals, representing the proportion of males and females.

Which of the following best describes an "age pyramid" in population studies?

A graphical representation of age distribution in a population
A method of classifying species based on reproductive success
A tool to estimate mutation rates in a population
A model to determine carrying capacity
1

An age pyramid represents the proportion of individuals in different age groups within a population, providing insights into its growth trend.

Which of the following is a key factor in determining an organism's biotic potential?

Availability of food
Reproductive rate
Predation pressure
Habitat destruction
2

Biotic potential refers to the maximum reproductive capacity of a species under optimal conditions.

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

They can outcompete native species for resources.
They have no impact on ecosystem dynamics.
They often lack natural predators in their introduced habitat.
They can alter food webs and ecosystem functions.
2

Invasive species can significantly impact ecosystem dynamics by disrupting food chains and reducing biodiversity.

Which type of competition occurs between two different species for the same resource?

Intraspecific competition
Interspecific competition
Mutualism
Parasitism
2

Interspecific competition occurs when individuals of different species compete for the same limited resources.

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