Mastering Biology with Pearson eText -- ValuePack Access Card -- for Campbell Biology: Concepts & Connections
8th Edition
ISBN: 9780321928054
Author: Jane B. Reece, Martha R. Taylor, Eric J. Simon, Jean L. Dickey, Kelly A. Hogan
Publisher: PEARSON
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Chapter 35, Problem 9TYK
Crows break the shells of certain molluscs before eating them by dropping them onto rocks. Hypothesizing that crows drop the molluscs from a height that gives the most food for the least effort (optimal foraging), a researcher dropped shells from different heights and counted the drops it took to break them.
| Height of Drop (m) | Average Number of Drops Required to Break Shell | Total Flight Height (Number of Drops × Height Per Drop) |
| 2 | 55 | 110 |
| 3 | 13 | 39 |
| 5 | 6 | 30 |
| 7 | 5 | 35 |
| 15 | 4 | 60 |
Data from R. Zach, Shell dropping: Decision-making and optimal foraging in northwestern crows, Behaviour 68: 106–17 (1979).
a. The researcher measured the average drop height for crows and found that it was 5.23 m. Does this support the researcher’s hypothesis? Explain.
b. Describe an experiment to determine whether this feeding behavior of crows is learned or innate.
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You are studying the effect that the commonly used agricultural pesticide "Pestkill" that has been found in bodies of water has on the survival rate of eggs of dragonflies. How will you label your X and Y axes? Check all that apply.
A "Pestkill concentration (mg)" as X axis label, "percentage of eggs hatched in two weeks" as Y axis label
B "Pestkill" as X axis label, "number of eggs" on Y axis
C "Pestkill concentration (mg)" as Y axis label, "percentage of eggs hatched in two weeks" as X axis label
D "Pestkill" as Y axis label, "number of eggs" on X axis
You are studying the effect that the commonly used agricultural pesticide "Pestkill" that has been found in bodies of water has on the survival rate of eggs of dragonflies. How will you label your X and Y axes? Check all that apply.
Pestkill concentration (mg)" as Y axis label, "percentage of eggs hatched in two weeks" as X axis label
"Pestkill" as X axis label, "number of eggs" on Y axis
"Pestkill" as Y axis label, "number of eggs" on X axis
"Pestkill concentration (mg)" as X axis label, "percentage of eggs hatched in two weeks" as Y axis label
Chapter 35 Solutions
Mastering Biology with Pearson eText -- ValuePack Access Card -- for Campbell Biology: Concepts & Connections
Ch. 35 - Prob. 1CCCh. 35 - Prob. 2TYKCh. 35 - Pheasants do not feed their chicks. Immediately...Ch. 35 - A blue jay that aids its parents in raising its...Ch. 35 - Prob. 5TYKCh. 35 - Prob. 6TYKCh. 35 - Prob. 7TYKCh. 35 - Prob. 8TYKCh. 35 - Crows break the shells of certain molluscs before...Ch. 35 - Prob. 10TYK
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