Biology: The Unity and Diversity of Life (MindTap Course List)
14th Edition
ISBN: 9781305073951
Author: Cecie Starr, Ralph Taggart, Christine Evers, Lisa Starr
Publisher: Cengage Learning
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Chapter 24, Problem 1DAA
Summary Introduction
To explain: The trial in which the most control crabs and experimental bled crabs died.
Concept introduction: Horseshoe crab belongs to Phylum: Arthropod. They are normally found around shallow ocean waters. Horseshoe crabs are living fossils. Though the horseshoe crabs look like crustaceans, they are marine arachnids.
Expert Solution & Answer
Explanation of Solution
The uniqueness of horseshoe crab is that they clot upon encountering bacteria. Therefore, they are used in experiments where highly virulent bacteria are involved. The blood of horseshoe crabs is taken and then, they are let out in their habitat in order to conserve their population, but this might also lead to their death. Therefore, experiments were conducted to check their survival after taking their blood and the results were obtained as seen in Fig.24.40 in the question.
In trial 5, the number of control crabs is 30; out of which, 1 died. In trial 5, the number of bled animals is 30; out of which, 6 died.
Conclusion
Conclusion: Trail group 5 marked the highest number of control crabs and bled crabs that died compared to the other trial groups.
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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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Chapter 24 Solutions
Biology: The Unity and Diversity of Life (MindTap Course List)
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