Essential Biology 5.3 WORD

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

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

1. Define population. “A group of organisms of the same species living in the same area at the same time.” (1 p. 36)

2. Draw a box diagram to show the effects of natality, mortality, immigration and emigration on a population:

3. Outline under which conditions a population will:

a. Grow

A population will grow when the natality or immigration rates increase to higher than the mortality and emigration rates.

b. Remain stable

The population will remain stable if mortality, natality, immigration and emigration grow or decrease at the same rate.

c. Decline

The population will decline if the mortality or emigration rates increase to higher than natality or immigration rates.

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

POPULATION

Immigration+

Emigration -

Mortality -

Natality +

http://tinyurl.com/34tofbg

http://sciencevideos.wordpress.com/


4. In the space below, draw a population growth curve.

Annotate it to explain the exponential, transition and plateau phases and car-rying capacity (K).

5. State three factors that set limits to population growth.

Three factors that limit popula-tion growth are the carrying ca-pacity, the rate of reproduction and the starting population

6. Use the population growth tutorial here:

http://bcs.whfreeman.com/thelifewire/content/chp54/5402002.html

What are the effects of:

a. Manipulating K?

If you manipulate K and make it higher than you can have a higher population, if you make it lower you have a lower population.

b. Manipulating r?

If you manipulate r to higher, than you get more rapid population growth if you make it lower the population grows slower.

c. Manipulating N0?

If the N0 is higher than there is less room for growth, if the N0 is lower than there is more room for the population to grow.


Exponential phase

Transition phase

Plateau phase

K- Carrying Capacity

I+N> E+M

There are abundant resources available, low competition for resources and high reproduction to create the population with low mortality rates

I+N> E+M

Resources begin to be more scarce and the competition increases because of the lack of resources, the rate of growth slows but mortality rates increase

I+N =E+M

Carrying capacity is reached so the population stabilizes because resources are scarce and competition becomes high for them.


http://bcs.whfreeman.com/thelifewire/content/chp54/5402002.html


7. ToK Discussion: Read this passage from Thomas Malthus’ An Essay on the Principles of Population, 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 de-population. They are the precursors in the great army of destruction, and of-ten finish the dreadful work themselves. But should they fail in this war of ex-termination, sickly seasons, epidemics, pestilence, and plague 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? That if there is no premature death than the human race will face lack of resources. There needs to be fatal diseases and deaths in order for the plant to provide the necessary resources for the population.

b. Look at human population growth over the last 300 years. What was the population in Malthus’ day? How about now? What about predic-tions for 2050?

In Malthus’ time, the world population in developing countries was at around 1 bil-lion people, and under 1 billion for industrialized countries. Today the population for developing countries is at about 8.5 billion and 1.2 billion for industrialized. In 2050 the estimated population for developing countries is 10 billion and about 1.3 billion for industrialized countries.

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

We have been able to keep the human population in the exponential phase for so long by finding alternative resources to reduce competition for resources so that our populations continue to grow. This is not sustainable because eventually everything will become reduced and there will be competition for resources and the planet will not be able to provide for the high number of people living on the planet.

Works Cited1. Allott, Andrew. IB Study Guide: Biology for the IB Diploma. s.l. : Oxford Univer-sity Press, 2007. 978-0-19-915143-1.

Self Assessment:




Essential Biology Assessment

Criterion 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 to access. All command terms highlighted or underlined.

Academic Honesty NA

Sources cited using the CSE (ISO 690 numerical) method, with Works Cited section complete and correct.

Objective 1 understanding

All answers for the following command terms correct:

Most answers for the following com-mand terms correct:

Define Draw Label List Measure State

Objective 2 understanding



Annotate Apply Calculate Describe Distinguish Estimate Identify Outline

Objective3understanding



Analyse Comment Compare Construct Deduce Derive Design Determine Discuss

Evaluate Explain Predict Show Solve Sketch Sug-gest

Logic, nota-tion, mathe-

matical work-ing

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.

Further re-search NA

Evidence is apparent of research and reading beyond the textbook and pre-sentations to find correct answers to

challenging questions. If any questions are unanswered, this criterion scores

zero.

Total (max 10):



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Essential Biology 5.3 WORD