
Concept explainers
Fill-in-the-Blank
Two examples of density-independent forms of environmental resistance are________ and __________. Two important types of density- dependent environmental resistance are__________ and__________. LO4

To review:
The given blank space in the statement, “Two example of density-independent forms of environmental resistance are ________ and _______. Two important types of density-dependent environmental resistance are _____ and __________.”
Introduction:
Environmental resistance acts as a means to regulate the population size in any given area, below or equal to the carrying capacity. There are mainly two types of environmental resistances, namely density-dependent and density-independent.
Explanation of Solution
Density-dependent resistance depends on the population density of any area. They mainly include factors such as any essential requirements, lack of which could lead to a decline in population, for example, food, nutrients, and space. Certain interactions such as predation and competition also arise due to rise in population and thus form a part of the density-dependent resistance.
Density-independent resistance acts independently from population density. They mainly include natural disasters and extreme climatic changes, which lead to drastic effects on population size. For example, flood, fire, storm, drought, habitat destruction, and freezing.
The given blank space in the statement, “Two example of density-independent forms of environmental resistance are fire and drought. Two important types of density-dependent environmental resistance are nutrient and space.”
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Chapter 26 Solutions
Biology: Life on Earth
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