Q: Given a scientific passage and an answer, generate a question for the given answer.
Passage: Gymnosperms are seed plants that produce naked seeds in cones. There are about 1000 species of gymnosperms. Conifers are the most common group of gymnosperms. The spruce tree in Figure below is an example of a conifer. Answer: gymnosperms
A:
What are seeds plants that produce naked seeds in cones called?