Children's conceptual understanding of growth

Growth is a property that is unique to living things. Studies demonstrate that even preschool children use growth to determine whether objects are alive. However, little identifies explanations that children use to attribute growth. The goal of the present study was to investigate how people reason about growth. We hypothesized that older children would outperform younger children in understanding that growth is inevitable for living things, while adults would consistently perform at ceiling levels. Our hypothesis was partially supported. Although adults consistently outperformed children, older children rarely outperformed younger children. Still, both younger and older children performed above chance in attributing growth. Moreover, all participants were more likely to use biological explanations to explain growth. Taken together, this research qualifies the early hypotheses of Piaget (1929) and Carey (1985) that children lack a well developed biological domain before age nine, but suggests that a biological domain, though less developed, is present. Based on these findings, implications for more efficient approaches to science education are discussed.