The number of organisms in the population divided by a regular unit of area or volume is called _______.
Show answer & explanation
Correct answer: C
Explanation
The correct answer is option 3 i.e. population density.
The number of organisms in a population divided by a regular unit of area or volume is called population density. It is a key ecological measure used to understand how crowded or sparse a population is within a given space. Population density helps scientists and ecologists analyze the distribution patterns of organisms, resource availability, competition, and environmental impact. For example, high population density may lead to competition for food and shelter, while low density might indicate limited reproduction or harsh environmental conditions. Unlike birth rate or death rate, which measure changes in population, population density focuses on spatial distribution at a specific time.