Organisms and Population
Test 1

Correct answer Carries: 4.

Wrong Answer Carries: -1.

Which of the following is NOT a level of ecological organization?

Organism
Population
Ecosystem
Cell
4

Ecology deals with levels from organisms to biomes, but the cell is a structural and functional unit of life, not an ecological level.

What is the term for the number of individuals per unit area or volume in a habitat?

Population density
Carrying capacity
Biomass
Age pyramid
1

Population density refers to the number of individuals in a specific area or volume, reflecting the population size in a habitat.

Which factor does NOT contribute to an increase in population density?

Natality
Immigration
Emigration
Both 1 and 2
3

Emigration reduces population density as individuals leave the habitat, while natality and immigration increase it.

Which of the following statements about population growth is correct?

Exponential growth occurs when resources are limited.
Logistic growth includes a carrying capacity.
Population growth is unaffected by resource availability.
Birth and death rates have no effect on population size.
2

Logistic growth considers carrying capacity, which limits population growth as resources become scarce.

Which of the following statements about species interactions is incorrect?

Mutualism benefits both species involved.
Commensalism harms one species and benefits the other.
Parasitism benefits one species at the expense of the host.
Competition occurs when two species vie for the same limited resource.
2

Commensalism benefits one species while having no effect on the other, making the given statement incorrect.

Which of the following statements about ecological succession is correct?

Primary succession begins on existing soil.
Secondary succession occurs after a disturbance in an area with existing life.
Pioneer species appear at the end of succession.
Climax communities are unstable and constantly changing.
2

Secondary succession occurs in areas where an ecosystem existed before but was disturbed, such as after a wildfire.

Which of the following statements about density-dependent factors is incorrect?

Disease spreads more rapidly in dense populations.
Food scarcity affects population size in a density-independent manner.
Predation pressure increases with higher population density.
Competition for resources is a density-dependent factor.
2

Food scarcity is a density-dependent factor, as its effects increase with population density.

Which of the following is an example of mutualism?

Tiger hunting deer
Lichen (algae and fungi)
Cattle egret and grazing cattle
Ticks on a dog
2

In lichens, both algae and fungi benefit. Algae provide food through photosynthesis, while fungi offer structural support.

Which of the following correctly represents an age pyramid of a stable population?

Broad base, narrow top
Bell-shaped
Inverted pyramid
Narrow base, broad middle
2

A bell-shaped age pyramid represents a stable population with nearly equal birth and death rates.

What type of growth curve is seen when resources are unlimited?

Logistic growth curve
S-shaped growth curve
J-shaped growth curve
Linear growth curve
3

Exponential growth results in a J-shaped curve when resources are unlimited, leading to rapid population increase.

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