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The orderly progress of communities, starting from bare rock with no soil traces of a previous community, is called
a. primary succession.
b. secondary succession.
c. subclimax community.
d. climax community.
Introduction:
Environmental resistance plays an important part in stopping the exponential growth in a population. It occurs through both density-dependent and density-independent mechanisms. As the name suggests, the density-independent mechanisms of limiting population do not depend on density related factors, for example, climate. Density-dependent factors, on the other hand, are dependent on density and include factors like prey-consumers interactions.
Answer to Problem 1MC
Correct answer:
Floods are a density-independent environmental resistance.
Explanation of Solution
Explanation for the correct answer:
Option (b) is given that the floods. This is correct as flood which can be classified as a weather or climatic condition occurs independent of 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 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 causes an increase in density 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 28 Solutions
Biology: Life on Earth (11th Edition)
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