Biology Ch. 21

3. the mature ovary of a flower
5. potent plant chemicals that contain nitrogen, some are medicinal in small amounts
8. flowering plants whose embryos have two seed leaves
9. a fibrous material made up of dead cells that are part of the vascular systems of some plants
10. the study of drugs and their effects on the body
11. a seed plant whose seeds are not enclosed in fruit, cone-bearing evergreens
14. the study of plants
15. the reproductive structure of flowering plants
16. a two-celled structure that contains a cell that will divide to form sperm
17. a waxy, waterproof layer that covers the surface of a plant
18. multicellular eukaryotes, most of which produce their own food and adapted to life on land

1. explores how people in different cultures use plants
2. a material that hardens the cell walls of some vascular tissues to give a plant support
4. a collection of specialized tissues that bring water and mineral nutrients to the leaves of plants
6. a seed plant that has seeds enclosed in some type of fruit, flowering plants
7. an embryonic leaf inside a seed
12. flowering plants whose embryos have one seed leaf
13. this occurs when pollen meets female reproductive parts of the same plant species
19. a storage device for a plant embryo