Biological Science (6th Edition)
6th Edition
ISBN: 9780321976499
Author: Scott Freeman, Kim Quillin, Lizabeth Allison, Michael Black, Emily Taylor, Greg Podgorski, Jeff Carmichael
Publisher: PEARSON
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Chapter 23, Problem 12PIAT
QUANTITATIVE Toucans can eat fruits with large seeds because their large bills can open very wide. Most other birds in the same forest can only eat small seeds. Ecologist Mauro Galetti and his colleagues measured the seed sizes of palms in forest fragments with and without toucans. The graphs show two of the forest populations they studied. What is the take-home message of the data?
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Use the key info from the previous slide to make a prediction about the finches
In 1977, there was a severe drought on the island,
which caused many of the plants to die out. Because
the finches eat the seeds of many of these plants, the
population of birds had to compete for the seeds
that were available. Most seed-eating finches prefer to
eat the small, soft seeds (particularly during the
drought), leaving only the large, tough Tribulus
seeds for the finches not lucky enough to get to the
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I predict that after the drought, .
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You've been out in the field collecting data on the predation of holly leaves. You collect 200 leaves in total of which 100 leaves contain one mine, 20 leaves contain 2 mines and 30 leaves contain 3 mines. After close examination with your hand lens and dissecting microscope you categorize a total of 15 mines with round holes, 9 mines that were torn open and 27 mines with an irregular hole. After some basic analyses you conclude that the predation rates by blue tits and wasps are:
A.
3.7% and 6.5%
B.
6% and 10%
C.
10% and 6%
D.
4% and 6.5%
Aphids and ants can have a mutualistic relationship. Aphids exude sugary substances that provide energy for ants and ants can defend aphid colonies from predators. This experiment measured the population growth rate of aphids vs the number of aphids at the start of the experiment on plants where ants were present or absent. Please select all the statements that are reasonable interpretations of this graph. Select all that apply.
A. When starting populations are low, the presence of ants does not matter. Their importance increases with higher starting population densities.
B. It appears that aphid populations founded with 12 individuals grow faster than aphid populations founded with 24 individuals when compared to each other in the same ant treatment..
C. none of the above.
D. The growth of rate of aphid populations was significantly higher when tended by ants than aphid population that were not tended
E. Ants seem to be necessary for small founding populations of…
Chapter 23 Solutions
Biological Science (6th Edition)
Ch. 23 - PROCESS OF SCIENCE In what sense is the...Ch. 23 - 2. Why isn’t inbreeding considered an evolutionary...Ch. 23 - 3. CAUTION Why is genetic drift aptly named?
a. It...Ch. 23 - 4. True or false? Gene flow can either increase or...Ch. 23 - 5. QUANTITATIVE In a population of 2500, how many...Ch. 23 - 6. In the 1700s and 1800s, royalty in Europe often...Ch. 23 - 7. CAUTION Determine what is incorrect in the...Ch. 23 - MODEL Draw a small concept map (BioSkllls 12 )...Ch. 23 - 9. QUANTITATIVE In humans, albinism is caused by...Ch. 23 - Prob. 10TYPSS
Ch. 23 - Are toucans important to tropical forests? Human...Ch. 23 - QUANTITATIVE Toucans can eat fruits with large...Ch. 23 - 13. Do these data illustrate directional,...Ch. 23 - 14. Large seeds carry more resources than small...Ch. 23 - 15. PROCESS OF SCIENCE The data in the graphs are...Ch. 23 - 16. SOCIETY If you were a journalist covering this...
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- An alpine wildflower species varies in flower color. There are red-flowered plants (RR), red and white-flowered plants (RW) and white-flowered plants (WW) in population. Initially, the genotype frequencies are red RR= 0.35, red/white RW=0.34. and white WW=.31 Flower color affects reproduction success because it influences pollinator behavior. After a new pollinator colonizes the meadow where this wildflower lives, the average number of offspring per plant is red=105, red/white= 89, white =96 What will be the genotype frequencies in the first generation of plants following natural selection due to the new pollinator? Round all values to 2 decimal places In the rationale, explain how you arrived at the answer A. RR=.71 RW=.07 WW=.22 B. RR=.34 RW=.60 WW=.06 C.RR=.68 RW=.23 WW=.09 D. RR=.45 RW=.52 WW=.03 E RR=.38 WW=.31 WW=.31 F. RR=.35RW=.34 WW=.31 Rationale:_______________________________________arrow_forwardAfrican elephants are threatened by poachers, who kill the elephants for their tusks. Both male and female elephants can grow tusks. There are some elephants that are tuskless (do not grow tusks). In the elephant population of Gorongosa National Park, the number of female elephants was monitored for many years. The graphs show the total female elephant population and the percent of tuskless females in that population from 1970 to 2015. Which of the following describes the trend in the female elephant population from 1970 to 1995 ? The overall population decreased, and the proportion without tusks increased. Answer A: The overall population decreased, and the proportion without tusks increased. A The overall population decreased, and the proportion without tusks decreased. Answer B: The overall population decreased, and the proportion without tusks decreased. B The overall population increased and then decreased, and the proportion without tusks…arrow_forwardReview the following figure, and then answer the two questions that follow. a)Given that beak size in mature adults does not change, what factor is driving the change in average beak size in Galápagos finches over time? Seed number Seed size Rainfall amounts Both b. and c. All of the above. b)What would you predict about beak size if the Galápagos experiences a wet year? More birds with small beaks will survive More birds with large beaks will survive Both a. and b. All of the abovearrow_forward
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