[Campbell Biology P.1199] Based on the provided graph, what is the relationship between platf... | Practice Question

Based on the provided graph, what is the relationship between platform height, the average number of drops to break a whelk, and the calculated total 'flight' height, and how does this relate to the crows' preferred drop height?

  • A: As platform height increases, the average number of drops always decreases, and the total flight height always increases.
  • B: The total flight height is minimized at a platform height of 5 meters, which closely matches the crows' observed preferred drop height of 5.23 meters, supporting the optimal foraging hypothesis.
  • C: Crows prefer dropping whelks from 5.23 meters because it requires the maximum number of drops, ensuring the whelk is thoroughly broken.
  • D: The average number of drops is consistently highest at 5 meters, indicating it is the most efficient height for breaking whelks.

Explanation

The graph shows that the calculated total 'flight' height green bars , representing energy expenditure, is lowest at a platform height of 5 meters. This energy minimum aligns very closely with the crows' observed preferred drop height of 5.23 meters. This consistency between the predicted optimal height minimum energy and the observed behavior strongly supports the optimal foraging hypothesis, which states that energetic considerations dominate selection for foraging behavior.