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Density-independent environmental resistance includes
predation.
parasitism. floods.
competition.
Introduction:
Environmental resistance plays an important role in combating the exponential growth of a population. It occurs through both density-dependent and density-independent mechanisms. As the name suggests, density-independent mechanisms of limiting population do not depend on density-related factors, e.g. is climate. On the other hand density-dependent factors depends on density and include factors like prey–consumers interactions.
Answer to Problem 1MC
Correct answer:
Floods is a density-independent environmental resistance.
Explanation of Solution
Explanation/justification for the correct answer:
Option (b) is given that the floods. This is a correct option as flood is classified as a weather or climatic condition that occurs independent to the density of the population but can have a drastic effect on the population. Density-independent factors involve weather and climate. These factors exert influence on the size of the population irrespective of the density of the population. Hence, option (b) is correct.
Explanation for the incorrect answers:
Option (a) is given that predation is a density-independent environmental resistance. This is incorrect as predation is a density-dependent environmental condition. An increase in density of prey makes predation easier. So, it is an incorrect option.
Option (c) is given that the parasitism is a density-independent environmental resistance. This is incorrect as parasitism is a density-dependent environmental condition. Increase in density is correlated to increase in parasitism. So, it is an incorrect option.
Option (d) is given that competition is a density-independent environmental resistance. This is incorrect as competition is a density-dependent environmental condition. Increase in density leads to an increase in competition. So, it is an incorrect option.
Hence, options (a), (c), and (d) are incorrect.
Thus, it can be concluded that floods can be classified as a density-independent environmental resistance.
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Chapter 27 Solutions
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