ogether in a third 5 ml. culture Each day asmall sample of each culture ws indiv
ID: 269373 • Letter: O
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ogether in a third 5 ml. culture Each day asmall sample of each culture ws individuals could be estimatod, and the remainder of the population was tranoferred to fresh growth The experimental results are repeesented in the graphs below. removed so the toal sumber of mediun Time (days) 1234 5678 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 23 Time (days 11. Which of the following satements best justife 9. Which of the following conclusions is best supported by the results of the esperimess? (A) Neither population grows as large whe the use of the experimental cesalts in an nvestigation of inenpecies competition (A) When two populations use different sources 1. Popalation of P. aarelia culbured alone culured together as each does when of energy, one of the populations will thrive is a shared environment and the other wi cultured separately ) When two populations use the same sources of energy,resource availability in a shared nvironment lmits the growth of both (C) Competition for mates increases when the species are cubured together compared with when they are cultured separately ae C) Becaose the change in entrogy of a system (D) Individuals of the species P.ndat maller when cultured together with P carelia than when cultured separately containing two different species is always positive, populations typically grow faster (D) Because the free energy of a systenm The difference in carrying capacity betwcen the two species when cultured separately is closest to which of the following values? containing two different species is always negative, populations that utiline similar resources cannot in nature (A) 0 individuals per 5.0 ml (B) 60?ndivaals per 5.0 mL (C) 150 individuals per 5.0 ml (D) 350 individuals per 5.0ml. 12345 6 78 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 Time (days)Explanation / Answer
9. If you look at the graphs, you can easily figure out that the maxima of growth for each of the strains is higher when grown individual than when grown together. Maximum growth for P. aurelia is about 550 individuals/ 5 ml and for P. caudatum is about 200 individuals/ 5 ml. When we comapre thier maxima in third graphs we see that the reduced maxima are- P. aurelia is about 350 individuals/ 5 ml and for P. caudatum is about 50 individuals/ 5 ml. Hence one thing we can conclusively say that neither population grows as large when cultured together as it does when cultured separately. Other statements such as competition for mates, food or difference in size etc cannot be varified from the information presented in the graphs. Therefore, your answer is (A).
10. We can caculate the carrying capacity for a particular population from the maxima of its respective graphs. For P. aurelia it is about 550 individuals/ 5 ml and for P. caudatum it is about 200 individuals/ 5 ml. Hence the difference in their carrying capacities = 550 - 200 = 350 individuals/ 5 ml. Therefore, your answer is (D).
11. We know that when two populations from the same species (in your case Paramecium) grow together, they use and consume similar substrate and other resources for survival, hence this sharing of resources limits the availabilty of resources for any one population and therefore those populations don't thrive as much as they would when grown separately and their growth in limited in shared environment. Your graphical results provide enough information to conclusively make the above statement only. Other statements cannot be conclusively derived from your experimental results presented here. Therefore, your answer is (B).
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