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Children's justifications of plants as living things between 5 and 7 years of age

Children do not recognize plants as living things before the age of 6. In order to consider plants as part of the biological domain, children have to inhibit motion as a mandatory characteristic of life and consider other properties as well. We designed a special animated task to help us study how children's explanations about plants change during preschool. This task contained pairs of items, with unexpectedly moving plants being contrasted with motionless animals and artefacts. Children were requested to compare these pairs and to answer “why” questions. Participants were 60 typically developing children aged 5, 6 and 7. Mention of the unexpected motion of plants increased with age, while biological justifications tended to be more frequent in older children for animals only. Functional justifications were hardly ever provided and only for plant–artefact pairs. These findings contribute to a better understanding of young children's conceptions of plants.