Organisms and Population Chapter-Wise Test 21

Correct answer Carries: 4.

Wrong Answer Carries: -1.

Which of the following statements about invasive species is incorrect?

Invasive species can outcompete native species.
They have no effect on ecosystem stability.
They often reproduce rapidly and spread aggressively.
They may lack natural predators in their introduced habitat.
2

Invasive species can significantly disrupt ecosystems by altering food webs, reducing biodiversity, and competing with native species.

What happens to a population when natality exceeds mortality and immigration exceeds emigration?

The population declines
The population remains stable
The population increases
The population reaches carrying capacity
3

If birth rate and immigration exceed death rate and emigration, the population size will increase.

Which of the following is an example of an ecological disturbance that can lead to secondary succession?

Lava flow creating new land
Glacial retreat exposing bare rock
Forest fire destroying vegetation
Coral reef formation
3

Secondary succession occurs in areas where life existed before but was disturbed, such as after a forest fire.

Which term describes the movement of individuals out of a population?

Immigration
Emigration
Natality
Carrying capacity
2

Emigration refers to the movement of individuals out of a population, reducing its size.

Which of the following statements about invasive species is incorrect?

Invasive species can outcompete native species.
They have no impact on ecosystem stability.
They often reproduce rapidly and spread aggressively.
They may lack natural predators in their introduced habitat.
2

Invasive species can significantly alter ecosystem stability by reducing biodiversity and changing food web dynamics.

Which of the following statements about the water cycle is incorrect?

Evaporation and transpiration contribute to water vapor in the atmosphere.
Precipitation returns water to Earth's surface.
The water cycle does not involve groundwater movement.
Condensation leads to cloud formation.
3

Groundwater movement is an important part of the water cycle, influencing water availability in ecosystems.

Which of the following represents an example of brood parasitism?

Cuckoo laying eggs in a crow’s nest
Honeybee collecting nectar
Tiger hunting deer
Orchid growing on a tree
1

Brood parasitism occurs when a species, such as a cuckoo, lays its eggs in the nest of another species, relying on them to raise its young.

Which term refers to the reproductive strategy where organisms reproduce only once in their lifetime?

Iteroparity
Semelparity
Viviparity
Oviparity
2

Semelparity is a reproductive strategy where organisms reproduce once before dying, as seen in certain insects and salmon.

Which of the following is a characteristic of a species with a Type II survivorship curve?

High survival in early life and rapid decline in old age
Constant mortality rate throughout life
Extremely high juvenile mortality
Low mortality until reproductive age
2

Species with a Type II survivorship curve, such as birds, experience a constant mortality rate at all life stages.

Which of the following is NOT a reason for population decline?

High emigration
Increased mortality
High birth rate
Declining food resources
3

High birth rates contribute to population growth, whereas emigration, mortality, and lack of resources lead to population decline.

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