Practice question

Agave is a classic semelparous plant: it grows vegetatively for years, stores resources, produces one exceptionally large flowering stalk, sets seed, and then the reproductive rosette dies. The defining feature is the single reproductive event. Stable resources or repeated seasonal flowering would instead support continued maintenance and iteroparity, while juvenile care is not the relevant mechanism in this plant. The r/K framework is best treated as a continuum. At one end, rapid development and many inexpensive offspring suit transient opportunities; at the other, slower development and greater investment per offspring can improve success near environmental limits. Modern life-history theory tests the underlying trade-offs directly rather than assigning every species to a fixed box. The key idea is the direction of the trade-off or feedback, because that direction determines the population-level outcome. Field evidence should therefore be compared with the model assumptions before extending the conclusion to every species, habitat, or time period.