CAMPBELL BIOLOGY-W/TEST PREP...>NASTA<
11th Edition
ISBN: 9780134588988
Author: Urry
Publisher: PEARSON
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Chapter 51, Problem 9TYU
SCIENTIFIC INQUIRY Scientists studying scrub jays found that “helpers” often assist mated pairs of birds by gathering food for their offspring.
(A) Propose a hypothesis to explain what advantage there might be for the helpers to engage in this behavior instead of seeking their own territories and mates.
(B) Explain how you would test your hypothesis. If it is correct, what results would you expect your tests to yield?
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Chapter 51 Solutions
CAMPBELL BIOLOGY-W/TEST PREP...>NASTA<
Ch. 51.1 - If an egg rolls out of the nest, a mother greylag...Ch. 51.1 - WHAT IF? Suppose you exposed various fish species...Ch. 51.1 - MAKE CONNECTIONS How is the lunar-linked rhythm...Ch. 51.2 - How might associative learning explain why...Ch. 51.2 - Prob. 2CCCh. 51.2 - Prob. 3CCCh. 51.3 - Why does the mode of fertilization correlate with...Ch. 51.3 - MAKE CONNECTIONS Balancing selection can maintain...Ch. 51.3 - WHAT IF? Suppose an infection in a common...Ch. 51.4 - Prob. 1CC
Ch. 51.4 - Prob. 2CCCh. 51.4 - Prob. 3CCCh. 51 - How is migration based on circannual rhythms...Ch. 51 - Prob. 51.2CRCh. 51 - In some spider species, the female eats the male...Ch. 51 - Prob. 51.4CRCh. 51 - Prob. 1TYUCh. 51 - Prob. 2TYUCh. 51 - Female spotted sandpipers aggressively court males...Ch. 51 - Prob. 4TYUCh. 51 - Although many chimpanzees live in environments...Ch. 51 - Prob. 6TYUCh. 51 - Level 3: Synthesis/Evaluation 7. DRAW IT You are...Ch. 51 - EVOLUTION CONNECTION We often explain our behavior...Ch. 51 - SCIENTIFIC INQUIRY Scientists studying scrub jays...Ch. 51 - SCIENCE, TECHNOLOGY, AND SOCIETY Researchers are...Ch. 51 - WRITE ABOUT A THEME: INFORMATION Learning is...Ch. 51 - SYNTHESIZE YOUR KNOWLEDGE Acorn woodpeckers...
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- INTERPRET DATA Look at the two graphs in Figure 52-21. In which experiment did the parentals in the experimental group guard the eggs more closely? In which experiment did the experimental parentals guard the young more closely? Account for these differences. RESULTS: Experiment 1: As indicated on the y-axis, which measures level of parental care, parentals reduced their level of guarding the eggs. Eight of the males in the experimental group abandoned their nests, and egg defense was significantly lower in this group compared with that in the control group. However, after eggs hatched, there was little difference in parental care of the young between the two groups. Experiment 2: During the egg phase, there was little difference in level of parental care between experimental and control groups. However, after eggs hatched, the experimental parentals significantly decreased their level of guarding the nest. CONCLUSION: Male bluegill sunfish adjust their level of parental care according to their level of perceived paternity. In Experiment 1, parentals provided less care when they perceived that the eggs may have been fertilized by sneaker males. After the eggs hatched, olfactory cues indicated that the offspring were indeed their own, and their level of care increased. In Experiment 2, parentals cared for the eggs even though some had been swapped. However, after they hatched, olfactory cues from the offspring indicated that they were not the parentals own offspring. The level of parental care decreased significantly. SOURCE: B.D. Neff, Nature, Vol. 422 (April 17, 2003): 716719. Figure 52-21 Decisions about parental carearrow_forwardEvidence supports that feathers evolved before flight, and were later co-opted for flight. This is an example of Group of answer choices exaptation preadaptation an intermediate state a selective constraintarrow_forwardSuppose you spot two species of birds feeding side by side, eating seeds from the same plant. You begin to wonder whether competition is at work. Describe how you might design scientific research to address this question. What observations would you try to make at the outset? Would you try to manipulate the system to test your hypothesis that the two birds are competing? If so, how?arrow_forward
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- Researchers observed that the crows only gather and drop thelargest whelks. What are some reasons crows might favor largerwhelks?arrow_forwardVervet monkeys in the wild exhibit which of the following scientific skills? responding to a leopard alarm call by standing upright and looking around before fleeing responding to an eagle alarm call by standing upright and looking around before fleeing responding to a leopard alarm call by diving out of trees into the undergrowth responding to an eagle alarm call by diving out of trees into the undergrowth responding to a snake alarm call by climbing into the treetops immediatelyarrow_forwardThese two Texas birds are both cuckoos . They live in different Analyze the birds in the pictures . Which bird is best adapted for life in a treeless desert environment and why ? F. Bird 1, because it has a crest on its head to focus sunlight on the head and a long tail for balance when standing or walking G. Bird 1, because it has long, broad feet to stand, walk, and run, and a strong , pointed bill for spearing prey H. Bird 2 , because it has small , narrow feet to perch on branches and take flight and a sharp, curved bill for spearing prey J. Bird 2 because it has a striped tail and dark upper body for camouflage in shade and a thick pointed bill for diggingarrow_forward
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