What makes a bee eusocial?

Question

BlackTom AI · Accepted Answer

The question asks what defines eusociality in bees. To evaluate each option, we recall the classic criteria for eusociality: overlapping generations within a colony, cooperative brood care (including non-reproductive individuals helping to raise offspring), and reproductive division of labor (the presence of sterile or mostly sterile workers and a reproductive cast).
Option 1: 'Overlapping generations, division of labor, cooperative brood care' This option lists overlapping generations and cooperative brood care, plus division of labor, which aligns with the core components of eusociality. However, the phrasing 'division of labor' here does not explicitly state that the workers are reproductively sterile or mostly non-reproductive, which is a key part of the eusocial definition.
Option 2: 'Overlapping generations, Reproductive  Division of labor (sterile workers), Cooperative brood care' This option includes overlapping generations, explicit reproductive division of labor with sterile workers, and cooperative brood care. Each element matches the three hallmarks of eusociality, making this a comprehensive and accurate description.
Option 3: 'Overlapping generations, morphologically different castes, cooperative brood care' This option mentions overlapping generations and cooperative brood care, and introduces morphologically different castes. While caste differentiation is associated with eusocial species, the criterion does not inherently require morphological castes, and the phrase does not explicitly include reproductive division of labor of sterile workers, which is central to eusociality as defined in many studies.
In summary, Option 1 is close but lacks explicit mention of reproductive division of labor, Option 3 introduces castes but omits explicit reproductive division of labor, and Option 2 explicitly includes all three defining components: overlapping generations, reproductive division of labor with sterile workers, and cooperative brood care, which together establish the eusocial pattern in bees.

ENTOM2030/ENTOM2031 Post-Lecture 9 Quiz

What makes a bee eusocial?

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