Biology
Biology
12th Edition
ISBN: 9780134813448
Author: Audesirk, Teresa, Gerald, Byers, Bruce E.
Publisher: Pearson,
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Chapter 27, Problem 1MC
Summary Introduction

Introduction:

Growth curve represents the population growth with each period of time. Growth curve can be demonstrated by two types of growth curve: J shaped growth curves and sigmoid growth curve. The J shaped growth curves represent the unrestricted or exponential population growth while sigmoid growth curve represents the slow or restricted growth of population.

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Answer to Problem 1MC

Correct answer:

Density-independent environmental resistance includes floods. Therefore, option (b) is correct.

Option (b) is given as “floods”.

Explanation of Solution

Justify reason for the correct statement:

Density-independent factors are those factors that affect population size irrespective of population density. Density-independent factors include weather, earthquake, floods, and climatic condition.

Hence, option (b) is correct.

Justify reasons for the incorrect statements:

Option (a) is given as “predation”.

Predation is density dependent environmental resistance. Hence, it is a wrong answer.

Option (c) is given as “differentiated cell”.

Parasitism is density dependent environmental resistance. Hence, it is a wrong answer.

Option (d) is given as “competition”.

Competition is density dependent environmental resistance. Hence, it is a wrong answer.

Hence, options (a), (c), and (d) are incorrect.

Conclusion

The factor floods are density independent environmental resistance.

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