Organisms and Population Chapter-Wise Test 15

Correct answer Carries: 4.

Wrong Answer Carries: -1.

Which of the following statements about ecological succession is incorrect?

Primary succession occurs in areas without pre-existing life.
Secondary succession happens in areas where an ecosystem previously existed.
Succession always leads to an unstable community.
Climax communities are relatively stable ecosystems.
3

Succession generally leads to a stable climax community, not an unstable one.

Which of the following statements about primary succession is true?

It occurs after a natural disaster like a wildfire
It begins in an area with no previous life or soil
It is faster than secondary succession
It always results in a climax community
2

Primary succession occurs in areas where life did not previously exist, such as on newly formed volcanic islands, and requires soil formation before larger plants can grow.

Which of the following describes a predator-prey relationship?

Cattle grazing on grass
Tick feeding on a dog
Tiger hunting a deer
Cuckoo laying eggs in a crow’s nest
3

A predator-prey relationship involves one organism (predator) hunting and consuming another (prey), like a tiger hunting a deer.

Which of the following factors is NOT a part of a species' ecological niche?

Its role in the ecosystem
Its interaction with other species
The physical space it occupies
The size of its population
4

A species' ecological niche includes its role, interactions, and habitat, but not its population size.

Which of the following is NOT an example of interspecific competition?

Lions and hyenas competing for prey
Flamingos and fish feeding on the same zooplankton
Two male deer fighting for a mate
Barnacles and mussels competing for space on rocks
3

Two male deer fighting for a mate is an example of intraspecific competition, as both belong to the same species.

What is the key difference between primary and secondary succession?

Primary succession occurs in a previously uninhabited area
Secondary succession happens on barren land
Primary succession occurs faster than secondary succession
Secondary succession never involves plants
1

Primary succession occurs in areas without previous life, while secondary succession happens where life existed before.

Which of the following represents an exponential population growth curve?

S-shaped curve
J-shaped curve
Bell-shaped curve
Linear growth curve
2

Exponential growth occurs under ideal conditions with unlimited resources, producing a J-shaped curve.

Which of the following statements about exponential growth is TRUE?

It occurs in environments with unlimited resources
It follows an S-shaped curve
It is regulated by carrying capacity
It slows down due to environmental resistance
1

Exponential growth occurs when resources are abundant and population size increases rapidly without limitation.

Which of the following is NOT a characteristic of r-selected species?

High reproductive rate
Short lifespan
Extensive parental care
Small body size
3

r-selected species focus on rapid reproduction and minimal parental care, unlike K-selected species.

Which type of population growth is represented by an S-shaped curve?

Exponential growth
Logistic growth
Arithmetic growth
Unrestricted growth
2

Logistic growth is represented by an S-shaped curve, where population growth slows as it nears carrying capacity.

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