Across
- 2. the central part of an ovule, containing the embryo sac
- 5. a division of plants, grouped within the gymnosperms, that consists of some 70 species across the three relict genera: Gnetum, Welwitschia, and Ephedra.
- 8. each of the microscopic particles, typically single cells, of which pollen is composed
- 10. seed plants with a long fossil history that were formerly more abundant and more diverse than they are today.
- 11. a "solid or highly viscous substance" of plant or synthetic origin that is typically convertible into polymers
- 12. a flowering plant's unit of reproduction, capable of developing into another such plant
- 13. a division of vascular land plants containing a single class, Pinopsida
Down
- 1. the protective outer coat of a seed
- 3. a tough outer protective layer, especially that of an animal or plant.
- 4. having the male and female reproductive organs in separate individuals
- 6. a leaf that bears sporangia
- 7. a monotypic genus of highly unusual non-flowering plants.
- 9. a group of seed-producing plants that includes conifers, cycads, Ginkgo, and gnetophytes.