Organisms and Population Chapter-Wise Test 10

Correct answer Carries: 4.

Wrong Answer Carries: -1.

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

Invasive species can outcompete native species for resources.
They have no impact on ecosystem stability.
They often lack natural predators in their new habitat.
They can alter nutrient cycling and ecosystem functions.
2

Invasive species often disrupt ecosystem stability by altering food webs, reducing biodiversity, and outcompeting native species.

What does the term "biotic potential" refer to?

The maximum reproductive capacity of a species under ideal conditions
The number of individuals in a population
The rate of immigration
The carrying capacity of an environment
1

Biotic potential is the highest possible reproductive capacity of a species when environmental conditions are optimal.

Which of the following is an example of an r-selected species?

Elephant
Human
Bacteria
Whale
3

r-selected species, such as bacteria, reproduce quickly and produce many offspring with little parental care.

Which of the following is a correct statement about nutrient cycles?

The nitrogen cycle involves bacteria in nitrogen fixation.
The phosphorus cycle has a significant atmospheric component.
The water cycle does not include transpiration.
Carbon is only cycled in terrestrial ecosystems.
1

Bacteria play a key role in the nitrogen cycle by converting atmospheric nitrogen into forms usable by plants.

Which of the following statements about the greenhouse effect is incorrect?

Greenhouse gases trap heat in Earth's atmosphere.
Carbon dioxide and methane are greenhouse gases.
The greenhouse effect causes a decrease in global temperatures.
Water vapor contributes to the greenhouse effect.
3

The greenhouse effect increases global temperatures by trapping heat in the atmosphere, not decreasing it.

Which of the following represents a density-independent factor affecting population growth?

Disease
Predation
Earthquake
Competition
3

Earthquakes are density-independent because they impact populations regardless of their size.

Which of the following statements about biodiversity is incorrect?

Biodiversity includes genetic, species, and ecosystem diversity.
Higher biodiversity increases ecosystem resilience.
Biodiversity loss has no impact on ecosystem stability.
Conservation efforts help preserve biodiversity.
3

Biodiversity loss negatively affects ecosystem functions, reducing stability and resilience to disturbances.

Which of the following is an example of secondary succession?

Lichen colonizing bare rocks
Regrowth of a forest after a wildfire
Coral reef formation in deep waters
Bacteria colonizing a new volcanic island
2

Secondary succession occurs when an existing ecosystem is disturbed but soil remains, such as after a wildfire.

Which of the following statements about carrying capacity is correct?

It is the maximum population size an environment can support indefinitely.
Populations always remain exactly at carrying capacity.
It is fixed and does not change with environmental conditions.
Exceeding carrying capacity has no impact on population stability.
1

Carrying capacity represents the largest population an environment can sustainably support over time.

Which factor is most important in determining the distribution of a species?

Predation pressure
Abiotic and biotic factors
Number of mutations
Geographical latitude
2

Species distribution is determined by abiotic (temperature, water) and biotic (predation, competition) factors.

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