Biology: The Unity and Diversity of Life (MindTap Course List)
15th Edition
ISBN: 9781337408332
Author: Cecie Starr, Ralph Taggart, Christine Evers, Lisa Starr
Publisher: Cengage Learning
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Chapter 24, Problem 2DAA
Sustainable Use of Horseshoe Crabs Horseshoe crab blood clots immediately upon exposure to bacterial toxins, so it can be used to test injectable drugs for the presence of dangerous bacteria. To keep horseshoe crab populations stable, blood is extracted from captured animals, which are then returned to the wild. Concerns about the survival of animals after bleeding led researchers to do an experiment. They compared survival of animals captured and maintained in a tank with that of animals captured, bled, and kept in a similar tank. FIGURE 24.28 shows the results.
FIGURE 24.28 Mortality of young male horseshoe crabs kept in tanks during the 2 weeks after their capture. Half the animals were bled on the day of their capture. Control animals were handled, but not bled. This procedure was repeated 8 times with different sets of horseshoe crabs.
Looking at the overall results, how did the mortality of the two groups differ?
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science
mussel defenses induced by the presence of
crabs?
Hypothesis: Mussels increase investment in defense in the presence of
crabs
Null hypothesis: Mussels do not increase investment in defense in
the presence of crabs
Experimental setup:
Seawater
No crab
Crab
(fed fish, not mussels)
Mussels
Mussels
Prediction: Mussels downstream of the crab tank will have thicker
shells than mussels downstream of the empty tank.
Prediction of null hypothesis: Mussels in the two tanks
will have shells of equal thickness
Results:
0.6-
0.4-
0.2
00
No crab
Crab
What conclusion can you draw from the figure above?
Without direct contact, mussels can sense the presence of crabs.
O Mussels can sense the presence of crabs only visually.
O Mussels are increasing their shell thickness in response to water current.
Shell thickness is a non-inducible defense.
O Crabs hunt for mussels by focusing on the chemicals they emit into the water.
Shell thickness lmm)
Land snail and slugs use which of the following for gas-exchange? (mark
all that apply)
the radula
the spiracles
the gastric caeca
nerdwax
the tracheae
the mantle
the lung
the gills
Chapter 24 Solutions
Biology: The Unity and Diversity of Life (MindTap Course List)
Ch. 24 - Sustainable Use of Horseshoe Crabs Horseshoe crab...Ch. 24 - Sustainable Use of Horseshoe Crabs Horseshoe crab...Ch. 24 - Sustainable Use of Horseshoe Crabs Horseshoe crab...Ch. 24 - Prob. 1SQCh. 24 - Prob. 2SQCh. 24 - Prob. 3SQCh. 24 - Prob. 4SQCh. 24 - Prob. 5SQCh. 24 - Prob. 6SQCh. 24 - Prob. 7SQ
Ch. 24 - Prob. 8SQCh. 24 - Prob. 9SQCh. 24 - Prob. 10SQCh. 24 - Prob. 11SQCh. 24 - _______ include the only winged invertebrates. a....Ch. 24 - Prob. 13SQCh. 24 - Match each structure with its descriptions. _____...Ch. 24 - Prob. 15SQCh. 24 - A massive die-off of lobsters in the Long Island...Ch. 24 - A rise in atmospheric carbon dioxide increases...
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