Across
- 4. the organelle of a living cell that contains chromosomes and is essential to the regulation and control of all the cells functions; also the core of an atom
- 5. A mature ovule containing an embryo and bound by a protective seed coat.
- 8. solid or highly viscous substance of plant or synthetic origin that is typically convertible into polymers.
- 12. division of vascular land plants containing a single extant class, Pinopsida. They are gymnosperms, cone-bearing seed plants. All extant conifers are perennial woody plants with secondary growth.
- 13. phylum that has fan-shaped leaves and fleshy seeds.
Down
- 1. grain a structure derived from the microspore of seed plants that develops into a male gametophyte
- 2. Classified with gymnosperms but has angiosperm-like characteristics, such as complex vascular tissue
- 3. 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. They usually have pinnate leaves. The individual plants are either all male or all female
- 6. Having unisecual flowers or cones with the male flowers or cones confined to certain plants and the female flowers or cones of the same species confined to different plants.
- 7. coat the outer boundary layer of a seed; it is developed from the integuments
- 9. the outermost layer of an ovule; usually develops into a seed coat; a gymnosperm ovule usually has a single integument, and an angiosperm ovule usually has two integuments.
- 10. a modified leaf that bears a sporangium
- 11. a plant whose seeds are not enclosed within an ovary during their development