Chapter 22

5. a plant that has seeds unprotected by an ovary or fruit. Gymnosperms include the conifers, cycads, and ginkgo
6. a leaf that bears sporangia
8. the central part of an ovule, containing the embryo sac
11. a tough outer protective layer, especially that of an animal or plant.
12. palmlike gymnosperm
13. (of a plant or invertebrate animal) having the male and female reproductive organs in separate individuals.

1. a divison of trees
2. a flowering plant's unit of reproduction, capable of developing into another such plant
3. a sticky flammable organic substance, insoluble in water, exuded by some trees and other plants (notably fir and pine).
4. each of the microscopic particles, typically single cells, of which pollen is composed. Have a tough coat that has a form characteristic of the pollen-producing plant and which can still be recognized in some archaeological deposits
7. gymnosperm,cone bearing seed plants
9. a coat for the seed
10. phylum gymnosperm that resembles angiosperm