Pre AP Biology -ECO 2.1 Population Structure- MCQ Exam Style Questions -New Syllabus
Pre AP Biology -ECO 2.1 Population Structure- MCQ Exam Style Questions – New Syllabus 2025-2026
Pre AP Biology -ECO 2.1 Population Structure- MCQ Exam Style Questions – Pre AP Biology – per latest Pre AP Biology Syllabus.
▶️ Answer/Explanation
The correct answer is a. fundamental niche.
The fundamental niche represents the entire set of conditions under which a population can survive and reproduce.
It includes the full range of resources a species is theoretically capable of using in the absence of competition.
In contrast, the realized niche is the actual space and resources a species uses due to biotic constraints like predation.
Resource partitioning refers to the division of resources to avoid direct competition between species.
Relative abundance is a measure of how common or rare a species is relative to other species in a community.
Therefore, the potential range of resources is defined strictly by the fundamental niche.
▶️ Answer/Explanation
The correct answer is a. malaria.
According to the World Health Organization ($WHO$), nearly $50\%$ of the global population lives in areas at risk of malaria transmission.
In $2022$, there were an estimated $249$ million cases of malaria across $85$ countries.
The disease is predominantly found in tropical and subtropical regions where Anopheles mosquitoes thrive.
While $HIV$ is a global pandemic, its prevalence does not put $50\%$ of the population at immediate risk of exposure.
Zika and West Nile viruses have significant impacts but are more geographically restricted compared to malaria.
Malaria remains one of the most widespread life-threatening parasitic diseases currently affecting humanity.
▶️ Answer/Explanation
The correct answer is b. density.
Population density is defined as the number of individuals of a species per unit area (e.g., $100$ trees per $km^2$) or volume (e.g., $50$ plankton per $m^3$).
Dispersion refers to the spacing patterns of individuals within those boundaries.
Population size refers to the total number of individuals, $N$, in the population regardless of area.
Age structure describes the distribution of individuals in different age groups.
Therefore, the ratio of $\frac{\text{Number of Individuals}}{\text{Unit Area or Volume}}$ specifically defines density.