Look at this first: http://www.mhhe.com/biosci/genbio/virtual_labs_2K8/labs/BL_1

Question

Look at this first: http://www.mhhe.com/biosci/genbio/virtual_labs_2K8/labs/BL_19/index.html

What is your hypothesis?

Make a hypothesis about how you think the two species of Paramecium will grow alone and how they will grow when they are grown together.

Explain how you tested your hypothesis.

Explain the differences in the population growth patterns of the two Paramecium species. What does this tell you about how Paramecium aurelia uses available resources?

Describe what happened when the Paramecium populations were mixed in the same test tube. Do the results support the principle of competitive exclusion?

Explanation / Answer

well we will assume that this is an competitive exclusion principle, stating that in two cloasely related species th ere is more severe competition. is the requirements are similar than the are chances that one species will eliminate the other.no two species can co-exist.

now let us talk about two species of Paramecium; P. aurelia and P. caudatum. when cultured separatelly then P. aurelia have much faster rate of growth than P. caudatum.

if they are cultured together in a same medium then P. aureia will out compete P. caudatum. this explains that two closely related species cannot co-exist. the competitively superior species will eliminate the weaker one. this is how it explains the concept of competitive exclusion. .

P. caudatum grows at a much slower pace. on doubling number it reaches a peak on the 8th day of growth.on the other hand P. aurelia is a strong species an grows at a higher rate. its number increases 5 times from day 2-4. after 4th day its number keep on doubling until when it reaches at a peak of growth. this explains that P. aurelia is stronger species than P. caudatum

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