Practice Questions Ch. 5 - Chapter 5 Avoiding Predators and...

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Chapter 5: Avoiding Predators and Finding Food 1.–5. Observation: You observe “shaky leaf walking” in a video of a Madagascaran mantid (one of about 1800 species, a member of one of dozens of genera of mantids, and a member of one of eight families of mantids). Hypothesis: The behavior works because it makes the mantid look like a dried leaf blown about on the leaf litter of the forest floor or a trembling leaf on a low- lying shrub. 1. State a prediction from this hypothesis that could be tested via additional observation. Answer : The mantid should be the size and shape of dried leaves in its actual habitat. 2. State a prediction that could be tested via experiment. Answer : In experiments with caged insect-eating birds, individual mantids placed on the appropriate background should take much longer to find than those placed on a nonleafy substrate. 3. State a prediction that could be tested via the comparative method (use a legitimate example of the comparative method based on the phenomenon of convergent evolution). Answer : The shaky leaf walking trait should appear in two or more families of mantids separated phylogenetically by other families whose members do not exhibit the trait; the several families in which shaky walking appeared independently should share similar ecological pressures, such as living on leaf litter and having predators that hunt visually. 4. State a prediction that could be tested via the comparative method (use a legitimate example of the comparative method based on the phenomenon of divergent evolution).
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  • Fall '08
  • HALPIN
  • Evolution, similar ecological pressures

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