Across
- 1. when the sepals fold back, they reveal the flower's colorful, leaflike
- 6. the vascular tissue through which food moves
- 7. the ripened ovary and other structures that enclose one or more seeds
- 8. most gymnosperms have reproductive structures called
- 9. a period when an organism's growth or activity stops
- 11. the female reproductive parts
- 13. a structure that contains a young plant inside a protective covering
- 15. a stage in which the plant produces spores
- 16. a fern's leaves
- 20. angiosperms that have only one seed leaf
- 22. when a flower is still a bud, it is enclosed by leaflike structures called
- 24. protects the root from injury as the root grows through the soil
- 25. thin, rootlike structures
- 26. the surface layers the leaf have small openings, or pores, called
- 29. a plant's response to seasonal changes in the length of night and day is called
- 30. a green pigment found in the chloroplasts of plants, algae, and some bacteria
- 32. have a flowering cycle that is not sensitive to periods of light and dark
- 33. a chemical that affects how the plant grows and develops
- 34. groups of similar cells that perform a specific function in an organism
- 36. One adaptation that helps a plant reduce water loss is a waxy, waterproof layer called the
- 39. angiosperms that complete their life cycle in two years are called
- 41. the transfer of pollen from male reproductive structures to female reproductive structures
- 43. a plant's growth response toward or away from a stimulus is called a
- 44. plants that lack vascular tissue for transporting materials are known as
- 45. a stage in which the plant produces sperm and egg cells
- 46. a blackish-brown material
- 49. occurs when a sperm cell unites with an egg cell
- 50. plants with true vascular tissue
- 51. the fetilized egg is called a
Down
- 2. the process by which water evaporates from a plant's leaves is called
- 3. a large storage sac that can expand and shrink
- 4. plants turn the sun's energy into energy our bodies can use through a process called
- 5. flowering plants that can live more than two years are called
- 8. the number of hours of darkness that determines whether or not a plant will flower
- 10. a structure that contains an egg cell
- 11. tiny structures that contain the cells that will later become sperm cells
- 12. a seed plant that produces naked seeds
- 14. the structures in which food is made
- 17. a system of tubelike structures inside a plant through which water, minerals, and food move
- 18. the reproductive structure of an angiosperm
- 19. occurs when the embryo begins to grow again and pushes out of the seed
- 21. protects the seeds as they develop
- 23. seed leaf
- 27. speeds up the rate at which a plant's cells grow and controls a plant's response to light
- 28. the male reproductive parts
- 31. angiosperms that have two seed leaves
- 35. flowering plants that complete a life cycle within one growing season are called
- 37. the young plant that develops from the zygote (or fertilized egg) is called the
- 38. a layer of cells that divides to produce new phloem and xylem
- 40. flower when the nights are longer than a critical length
- 42. flower when nights are shorter than a critical length
- 47. flowering plants
- 48. water and minerals, on the other hand, travel in the vascular tissue called