Biology: The Unity and Diversity of Life
15th Edition
ISBN: 9780357093795
Author: STARR
Publisher: CENGAGE LEARNING (CUSTOM)
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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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Experiment on The Predator-prey Interactions Between Zebrafish and Daphnia1. Six 1-L beakers were filled with aged tap water.2. To test the effect of light on the survival of Daphnia, the 6 beakers were divided equally into 2 treatments: light & dark. Beakers assigned to the dark treatment were covered w/ aluminum foil.3. One zebrafish (about 2-3 cm) starved for 24 hours was placed in each beaker.4. Fifty (50) Daphnia sp. individuals were added in each beaker containing the starved zebrafish. The top of the beakers assigned to the dark treatment were covered with aluminum foil.5. One hour after, the zebra fish was scooped out & the no. of surviving Daphnia in each set-up were counted.
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There is no way to regenerate nonrenewable resources.
True
False
Chapter 24 Solutions
Biology: The Unity and Diversity of Life
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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