Chapter 44 Question 14 - Case Study How do pheromones keep a hive of honeybees b

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Chapter 44 Question 14 - Case Study How do pheromones keep a hive of honeybees buzzing? Honeybees live in social groups consisting of a queen, up to several hundred male drones, and thousands of infertile female workers. The drones mate with the queen only, and the workers protect the hive, forage, and feed and groom the queen. The health of the hive depends on the female workers performing these duties instead of reproducing. What roles do pheromones play in maintaining a functional beehive? Part A Researchers observed that the queen produces a pheromone that is very attractive to both drones and workers. They hypothesized that this pheromone inhibits ovarian development in the workers, making the workers infertile. To test this hypothesis, they exposed workers to a synthetic version of the queen pheromone and then recorded their "ovary development score." (Higher scores indicate more ully developed ovaries. The results are shown in the graph below. Do hese res s s or the researchers hypo ess? A or why not? signifies 3.5 3.0 25 2.0 1.5 1.0 0.5 Control Queen Source: Hoover, S. E. R., C. I. Keeling, M. L. Winston, et al. 2003 Naturwissenschaten 90: 477-480 The results don't support the hypothesis because ovaries of workers in the control group were not fully developed too. The results support the hypothesis because ovaries were less developed in workers exposed to the queen pheromone than in workers in the control group. Submit My Answers Give Up

Explanation / Answer

Q 14. Ans. According to the test results the development of the ovaries in presence of the queen released pheromone is less than the con troll where the development of the ovaries allowed in absence of queen released pheromone. The P value of this result is < 0.001 means values obtained through the experiment are highly significant. Thus the results supports the theory of researcher that ‘queen released pheromone inhibits the development of ovaries in workers’.

Q 12. Ans. A worker, because workers protect the hive.

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