Across
- 1. a tough outer protective layer, especially that of an animal or plan
- 5. a flowering plant's unit of reproduction, capable of developing into another such plant
- 6. a division of vascular land plants containing a single class, Pinopsida
- 8. leaves that bear sporangia
- 10. a sticky flammable organic substance, insoluble in water, exuded by some trees and other plants
- 11. a division of plants, grouped within the gymnosperms, that consists of some 70 species across the three relict genera: Gnetum, Welwitschia, and Ephedra
- 12. a plant that has seeds unprotected by an ovary or fruit
Down
- 2. monotypic genus of highly unusual non-flowering plants
- 3. the central part of an ovule, containing the embryo sac
- 4. seed plants with a long fossil history that were formerly more abundant and more diverse than they are today
- 7. each of the microscopic particles, typically single cells, of which pollen is composed
- 9. having the male and female reproductive organs in separate individuals.
- 13. the protective outer coat of a seed.