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Chapter 53: 3 (page 1205)

MAKE CONNECTIONS Negative feedback is a process that regulates biological systems (see Concept 40.2). Explain how the density-dependent birth rate of dune fescue grass exemplifies negative feedback.

Short Answer

Expert verified

The density-dependent birth rate of the dune fescue grass exemplifies negative feedback because the output of a process slows the effect of the stimulus and reduces the production of the product.

This means that an increasing number of individuals leads to high population density. The high population density decreases population growth by reducing the birth rate.

Step by step solution

01

Negative feedback system 

A negative feedback system is an automated system that prevents future production by the systemand ensures that the product of a process does not reach increased amounts. In a negative feedback system, the presence of a product will decrease the further stimulus and more product production.

02

Density-dependent birth rate 

A population鈥檚 density-dependent birth rate causes an increased number of individuals.Alow birth rate reduces population growth as a result of the high population density. A regulated population occurs when more than one density-dependent factor leads to a decrease in size when the population is large.

03

Negative feedback in a biological system 

The negative feedback system is a more specific process that regulates the biological system as it maintains homeostasis, in which the response reduces the stimulus. Negative feedback is seen by the density-dependent birth rate of the dune fescue grass.

When the population of the dune fescue grass increases, it causes an accumulation of individuals that leads to high population density. The high population density decreases the growth of the population by reducing the birth rate.

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Most popular questions from this chapter

Which of the following statements about human populations in industrialized countries is incorrect?

(A) Birth rates and death rates are high.

(B) Average family size is relatively small.

(C) The population has undergone a demographic transition.

(D) The survivorship curve is Type I.

Which of the following organisms is incorrectlypaired with its trophic level?

(A) cyanobacterium鈥攑rimary producer

(B) grasshopper鈥攑rimary consumer

(C) zooplankton鈥攑rimary producer

(D) fungus鈥攄etritivore

Scientific study of the population cycles of the snowshoe hare and its predator, the lynx has revealed that

(A) predation is the dominant factor affecting prey population cycling.

(B) hares and lynx are so mutually dependent that each species cannot survive without the other.

(C) both hare and lynx population sizes are affected mainly by abiotic factors.

(D) the hare population is r-selected and the lynx population is K-selected.

If ris doubled, predict how the population growth rates will change for the four population sizes given in question 1. Now calculate the population growth rate for the same four cases, this time assuming that r= 2.0 (and with Kstill = 1,500).

Population ecologists follow the fate of same-age cohorts to

(A) determine a population鈥檚 carrying capacity.

(B) determine the birth rate and death rate of each group in a population.

(C) determine if a population is regulated by density-dependent processes.

(D) determine the factors that affect the size of a population.
See all solutions

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