yacomine_essential biology 05.3 - populations_121210

8/8/2019 Yacomine_Essential Biology 05.3 - Populations_121210

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Essential Biology 5.3 Populations Due Date:09-12-2010

Student Name:

Stephen Taylor Bandung International School http://sciencevideos.wordpress.com

Blog resource: http://tinyurl.com/34tofbg

1. Definepopulation. A group of organisms of the same species living in the same area at thesame time.

(1 p. 36)

2. Draw a box diagram to show the effects ofnatality, mortality, immigration and emigration on apopulation: Immigration

Natality

Mortality

Emigration

3. Outline under which conditions a population will:a. Grow: A population will grow when there are a lot of resources, for example food and light,

there is not that much competition from other inhabitants, an ideal environment and when

there is not much predation or disease

b. Remain stable: A population will remain stable when there is the same amount of births andimmigrations as there are deaths and emigrations

c. Decline: There will be a decline in population when there are so many organisms that theyfight for resources, when predators immigrate to the area because of the amount of food,

and the rapid spread of diseases due to the lack of space

Populations


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4. In the space below, draw a population growth curve.Annotate it to explain the exponential, transition andplateau phases and carrying capacity (K).

5. State three factors that set limits to population growth.Three factors that set limits to population growth are disease, predation and competition of

resources.

6. Use the population growth tutorial here:http://bcs.whfreeman.com/thelifewire/content/chp54/5402002.html

What are the effects of:

a. Manipulating K?The effect of manipulating carrying capacity is that the size of populations will change.

Exponential phase: Rate

of population growth israpid as resources are

abundant and

competition and

mortality are low.

Transitional Phase: As

resources become more

scarce, competition and

mortality increase. The

rate of growth slows

though the population

continues to grow.

Plateau Phase: When a

population reaches its

carrying capacity, the

population remains

stable as resources are

scarce and mortality is

high.


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b. Manipulating r?The effect of manipulating the rate of reproduction is that the number of births in the area

will change.

c. ManipulatingN0?The effect of manipulating the starting population is the extra space in the area will change.

7. ToK Discussion: Read this passage from Thomas Malthus An Essay on the Principles ofPopulation, written in 1798. Find out more about Malthus and his ideas.

"The power of population is so superior to the power of the earth to produce subsistence for man that

premature death must in some shape or other visit the human race. The vices of mankind are active and

able ministers of depopulation. They are the precursors in the great army of destruction, and often finish

the dreadful work themselves. But should they fail in this war of extermination, sickly seasons, epidemics,pestilence, andplague advance in terrific array, and sweep off their thousands and tens of thousands.

Should success be still incomplete, gigantic inevitable famine stalks in the rear, and with one mighty blow

levels the population with the food of the world."

a. What are his predictions for the population?Malthus predictions are that the human population will increase so much that the earth

will overpopulate, causing massive depopulation.

b. Look at human population growth over the last 300 years. What was the population inMalthus day? How about now? What about predictions for 2050?

According to the graph, the human population was approximately 1 billion in Malthus day. It is currently

6.6 billion. I predict, due to the rate of increase shown in the graph, that the human population will be

approximately 10 billion in the year 2050.


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c. How have we as a species been able to keep the human population in the exponentialphase for so long? Is this sustainable?

I think we have kept the human population in the exponential phase for so long because

we have been able to use our resources effectively. However, this is not sustainable, in

my opinion, because resources are limited and will run out eventually, and there will be

famine, decreasing the earths population rapidly.

Works Cited

1. Allott, Andrew.IB Study Guide: Biology for the IB Diploma. s.l. : Oxford University Press, 2007. 978-0-

19-915143-1.


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Self Assessment:

Essential Biology AssessmentCriterion Complete (2) Partially complete (1) Self MrT

Presentation &

Organisation NA

File names sensible, work complete and well-

presented. Filed in order of topic, and easy toaccess. All command terms highlighted or

underlined.

1

Academic

HonestyNA

Sources cited using the CSE (ISO 690 numerical)

method, with Works Cited section complete and

correct.

1

Objective 1

understanding

All answers for the following command terms

correct:

Most answers for the following command terms

correct: 2

Define Draw Label List Measure State

Objective 2

understanding

All answers for the following command terms correct:Most answers for the following command terms

correct: 2

Annotate Apply Calculate Describe Distinguish Estimate Identify Outline

Objective3

understanding

All answers for the following command terms correct:Most answers for the following command terms

correct:2

Analyse Comment Compare Construct Deduce Derive Design Determine Discuss

Evaluate Explain Predict Show Solve Sketch Suggest

Logic, notation,

mathematical

working

NA

Answers are presented in a logical and concise

manner. SI units used most times, with correct

unit symbols and definitions of terms. All

mathematical working shown.

1

Further research NA

Evidence is apparent of research and reading

beyond the textbook and presentations to find

correct answers to challenging questions. If any

questions are unanswered, this criterion scores

zero.

1

Total (max 10): 10

yacomine_essential biology 05.3 - populations_121210

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