Across
- 6. each of the microscopic particles, typically single cells, of which pollen is composed
- 7. an embryonic plant enclosed in a protective outer covering
- 10. a group of seed-producing plants that includes conifers, cycads, Ginkgo, and gnetophytes
- 11. a small group of gymnospermous vascular plants that are represented by three living genera: Ephedra, Gnetum, and Welwitschia
- 12. the central part of an ovule, containing the embryo sac
- 13. seed plants with a long fossil history that were formerly more abundant and more diverse than they are today. They typically have a stout and woody trunk with a crown of large, hard and stiff, evergreen leaves
Down
- 1. a tough outer protective layer
- 2. also known as Coniferophyta or Coniferae, or commonly as conifers, are a division of vascular land plants containing a single class, Pinopsida. They are gymnosperms, cone-bearing seed plants
- 3. a leaf that bears sporangia
- 4. "solid or highly viscous substance" of plant or synthetic origin that is typically convertible into polymers
- 5. monotypic genus of highly unusual non-flowering plants
- 8. the protective outer coat of a seed
- 9. having the male and female reproductive organs in separate individuals