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Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
ISBN: 9781337408332

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BuyFindarrow_forward

Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
ISBN: 9781337408332
Textbook Problem
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The rate at which population size grows or declines depends on the rate of ______.

  1. a. births
  2. b. deaths
  3. c. immigration
  4. d. emigration
  5. e. available resources
  6. f. all of the above

Summary Introduction

Introduction: Population size is the number of individuals in a population. Biologists often use sampling techniques to estimate the population size. It is the current total population of the species within the specified geographical area based on the naturally occurring resources. The population size depends on the rate of different factors that includes birth rate, death rate, immigration, and emigration.

Explanation

Reason for the correct statement:

Population size is the total number of population within a specified area.

Option f. is given as “all the above.” The rate at which all the population sizes grow or decline depends on the rate of “births”, “deaths”, “immigration”, “emigration”, and “available resources”. These are all correct. Hence, the correct answer is option f.

Reasons for the incorrect statements:

Option a. is given as “births”. The birth rate is the total number of live births in a population. The population size increases with an increase in the birth rate. The option that is given as ‘birth’ is not the only factor that influences the population size but the other factors like death also determines the population size.

Hence, option a. is incorrect.

Option b. is given as “deaths”. The death rate is the number of deaths in a population over a given period of time. This plays a significant role in a decrease in the population size. The option that is given as ‘death’ is not the only factor that influences the population size but the other factors like immigration and birth also determines the population size.

Hence, option b. is incorrect...

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