Chapter 26, Problem 1FIB

Summary Introduction

Introduction:

The natural environment is composed of living and non-living factors. The environment is defined as everything by which living organisms are surrounded. It involves physical, chemical and other natural forces.

Answer to Problem 1FIB

Correct answer:

Two examples of density-independent forms of environmental resistance are drought and flood. Two important type of density-dependent environmental resistance are predation and competition.

Explanation of Solution

Density-independent factors involve natural conditions such as freezing, drought, flood, fire and so on. These factors effects population size of organisms. Its intensity increases due to the increases in the size of the population of organisms. Density-dependent factors affect the size and growth of a population that may vary with population density. It involves a process of predation, competition for same resources among organisms.

Conclusion

Density-independent factors involve freezing, drought, flood, fire and so on whereas density independent factors involve predation, competition, disease and so on.