WHAT IS LIFE? GDE.TO BIOLOGY W/PHYSIO.
5th Edition
ISBN: 9781319272531
Author: PHELAN
Publisher: MAC HIGHER
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Chapter 16, Problem 9MC
Summary Introduction
Introduction:
A population pyramid or age pyramid gives the number of individuals in different age groups.
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Students have asked these similar questions
When discussing population size, we are referring to
a.
the total number of individuals in a population.
b.
the size of the geographic region in which a population is found.
c.
the number of individuals in a population divided by the area of the region covered by the population.
d.
the number of individuals in a population multiplied by the area of the region covered by the population.
e.
the specific type of environment in which a population can exist.
Which of the following accurately describes a trophic cascade?
a. Sunflower stars, as a primary predator within Northern California bull kelp forests, have an indirect positive impact on the sea
urchin's main prey, the bull kelp.
b. Sunflower stars, as a primary predator within Northern California bull kelp forests, have an direct positive impact on the sea
urchin's main prey, the bull kelp.
c. Sunflower stars prey directly on kelp and keep kelp populations in check.
d. The presence of Pisaster sea stars benefits Mytilus mussels, a primary producer.
The graph shows the worldwide human population from 1950 to 2050. Data for the future years are predictions.
According to the ideas of Thomas Malthus, what are the predicted changes to the human population after 2050?
A.
The population would continue to increase at the same rate, due to constant food supplies.
B.
The population would increase more rapidly, due to advances in technology.
C.
Eventually the population would stop increasing or would decrease, due to lack of food and living space.
D.
Eventually the population would decrease to zero, because of war, famine, or disease.
Chapter 16 Solutions
WHAT IS LIFE? GDE.TO BIOLOGY W/PHYSIO.
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- Population growth is exponential for the human population. It is an example of a positive feedback cycle where with each child born, the potential number of parents increases in the future. What is the most logical conclusion as to when the human population will reach its carrying capacity? A. When a regulating factor exists that keeps the population at equilibrium B. When feedback mechanisms kick in and population growth declines below carrying capacity C. When equilibirum is reached D. When density-dependent factors come into play and population levels start to decline ❌arrow_forwardA population’s ecological footprint is measured in terms of: a how many resources the population uses. b how much land area is needed to support its lifestyle. c the amount of waste/pollution it produces. d the number of people who live there.arrow_forwardWhich of the following is best at showing the life expectancy of an individual within a population? a. quadrat b. mark and recapture c. survivorship curve d. life tablearrow_forward
- Briefly explain how each demographic parameter can affect a population. This can be in terms of population structure, growth, decline or survival of the individuals etc.? Dispersion Age structure Fecundity Mortality Sex-ratioarrow_forwardScenario: You are conducting a study on the influence of population density on body mass in leafy seadragons in oceans off the coast of Australia. You are investigating the biological hypothesis that population density influences body length, and the prediction that individual leafy seadragons in higher density populations will have smaller body length. You have randomly sampled 15 leafy seadragon individuals from each of two locations in Australia, one location has a naturally low population density and the other area has a naturally high population density. The descriptive statistics of leafy seadragon body length (in cm) are shown in the table. What value best represents the t-statistic? (only 2 decimal places are given, recall there could be very minor variation due to rounding.) Low population density High population density X̄ 16.3 15.3 s 2.1 1.7 n 15 15arrow_forwardAnswer the following questions: Why do we usually express crude birth and death rates per thousand people? Why not give the numbers per person or for the entire population. Some demographers claim that the total world population has already begun to slow, while others dispute this claim. How would you recognize a true demographic transition as opposed in mere random fluctuations in birth and death rates?arrow_forward
- Which of the following statements about exponential growth is FALSE? O a. Increases in the size of the population do not affect per capita rate of increase (r). Ca. b. Exponential growth adds a constant number of individuals per unit time to a population as N gets larger. C. In reality, it is not possible for exponential population growth to continue indefinitely. d. In an exponentially growing population, the % increase of the population per unit * time doesn't depend on the number of individuals (N) in the population.arrow_forwardWhich statement about environmental stochasticity is true? O A. Environmental stochasticity places grizzly bears in Yellowstone National Park at risk for extinction despite the average positive growth rate of this population. O B. There is no fundamental difference between environmental stochasticity and demographic stochasticity. O C. In a situation of environmental stochasticity, the underlying birth and death rates of individuals are constant across years. D. All of the above E. None of the abovearrow_forwardTable 3.5 shows the number of deaths by age group in the United States in 2002 from all causes and incidents (unintentional injuries). Examine the rates mentioned below. Determine ,what to call each one then use the data to measure it as seen in the table. a. All-cause mortality rate for 25–34 year olds. Calculate the age-specific mortality rate. b. All-cause mortality among males. Calculate the sex-specific mortality rate.arrow_forward
- Growth rate of a population is determined by: A. The increase in the number of people per unit of time. B. The number of people being born minus the number of people dying. C. The number of children living per each two adults. D. The number of people times the number of children each one has per year.arrow_forwardConsider the evolution of the population of a species of small rodents. Assume that the number of males and females are nearly equal. Due to statistical data one can assume that each female remains a juvenile for one year and then becomes an adult, and that only adults have offspring. The reproduction rate is 2. The adult surviving rate is α. The juvenile surviving rate is 2/5. Initially the population counted 100 females and 40 juveniles. What values of the adult surviving rate will ensure that the population stabilize?arrow_forwardAlyce is studying populations and how they grow. She has a population of goldfish that she's been observing. Alyse hypothesizes that the birth rate and death rate are related to the growth rate of the population. Is she correct? Choose the best answer. O a. Yes, the growth rate is equal to the birth rate minus the death rate O b. No, the birth rate and death rate are completely separate from growth rate O c. Yes, the birth rate plus death rate is equal to the growth rate O d. No, the growth rate is equal to only birth ratearrow_forward
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