Plant Science

1. Plant Science Agriscience Applications

2. Careers in Plant Science Objective: Investigate career opportunities related to plant science industries

3. Careers in Plant Science • Career Areas: • Forest Careers • Growing, managing and harvesting trees for wood and its by-products • Horticulture Careers • Floriculture- flower production and use • Landscape and nursery- plants used around homes and businesses for aesthetic purposes

4. Careers in Plant Science • Forest Careers • Forester • Helps with the science of growing trees • Forest Ranger • Management of forest including fire prevention • Logging Foreman • Supervise the harvesting of trees

5. Careers in Plant Science • Floriculture (Horticulture) • Floral designer • Flower grower • Greenhouse manager • Retail florist • Wholesale florist

6. Careers in Plant Science • Landscaping and nursery (Horticulture) • Greenskeeper- cares for golf courses • Landscaper- installs plants • Landscape architect • Nursery operator- grows trees and shrubs • Turf farmer- grows turf (grass) for sale

7. Plant Parts and Functions Objective: Explain the function of major plant parts as related to plant growth and health

8. Plants • Composed of many parts • Roots • Stems • Leaves • Flowers

9. Roots • Often the largest part of the plant • Squash can have miles of roots • Adventitious roots • Found in places unexpected • Poison ivy • Mistletoe

10. Root Two types of systems • Taproot- main root that usually grows down • Carrots • Fibrous roots- thin, hair like, and numerous • Grass • Corn

12. Root Tissue • Root cap- outermost part of a root • Tough cells that penetrate the soil • Pushes through soil partials

13. Roots • Area of cell division • Allows roots to grow longer • New cell replace worn away cells • Area of cell elongation • Between the root cap and the plan base • Cells become longer • Cells become specialized

14. Roots • Xylem • Carries water and nutrients to the upper portion of the plant • Phloem • Pipeline • Carries food to the roots • Food is stored in the roots

15. Roots Areas of cell maturation • Where cells mature • Root hairs emerge • Develop on the surface of the root • Absorb water and nutrients • Damaged easily • Cannot be replaced

16. Tap or fibrous???

17. Stems • Support leaves, flowers, fruit • Types of stems: • Woody • Herbaceous • Other stems: • Bulbs (onions) • Rhizomes (wiregrass) • Tubers (potato)

18. Light Carbon dioxide + water = sugar + oxygen Leaves • Manufactures food for the plant • Converts sunlight into food • Photosynthesis

19. Leaves • Help in the identification of plants • Leaf margins • Shape and size varies with each species • Simple leaves • Compound leaves

22. Photosynthesis Objective: Explore the photosynthesis process as related to growth and development of a plant

23. Think! • Turn to a partner & come up with 3 reasons why you think photosynthesis is important & 3 reasons why photosynthesis is not important

25. Process • Light energy is connected to chemical energy • Chloroplast contains chlorophyll • Simple sugars are made (glucose) • Carbon dioxide is used • Oxygen is produced

26. Learning the Photosynthesis Equation • Oxygen • Carbon dioxide • Glucose • water

28. Glucose Oxygen Carbon Dioxide Water Photosynthesis 6CO2+6H2O C6H12O6+6O2

29. Photosynthesis (overview) • What’s occurring? • Food is produced • Energy is stored • It occurs is cells that have chloroplasts • Oxygen is released • Water is used • Carbon dioxide is used • It happens in sunlight

31. Slowing Photosynthesis • Low Carbon dioxide • Greenhouse • Carbon dioxide generators

32. Slowing Photosynthesis • Low Light • Dark rooms • Light intensity matters • Temperature • Best at 65-85 degrees Fahrenheit • Extreme temps can stop photosynthesis

33. Respiration • Food is used • Energy is released • Oxygen is used • Carbon dioxide is produced • Occurs in both light and dark

34. Transpiration • Release of water vapor from the stomata • 90% of the water entering the roots • 10% is used in chemical processes • Functions: • cooling • transportation • maintaining turgor pressure

35. Plant Reproduction Objective: Describe flower and seed parts, including their function

36. Plant Reproduction • Two types of propagation: • Sexual • use of seed for reproducing plants • only way to obtain new varieties and hybrid vigor • often least expensive and quickest • Asexual • vegetative • exact duplicate

37. Flowers • Functions to produce seeds • Types of flowers • Perfect (both male and female) • Imperfect • Pollination • The union of pollen with the female part of the flower

40. Parts of the Flower • Stamen (male part) • Filament • Anther- manufactures pollen • Pollen- male sexual reproductive cell

41. Parts of the Flower • Pistil (female part) • Stigma- receives the pollen • Style- connection to the ovary • Ovary- contains the ovules or female reproductive cells

42. Parts of the Flower • Petals (corolla) • Colored part of the flower • Attract insects or other natural pollinators

43. Parts of the Flower Pollen Stamen (Male) Anther Filament Stigma Style Pistil (Female) Ovary

44. Anther Filament Flower Parts

50. The Seed Parts of the seed: • Seed Coat offers protection • Endosperm supplies food for the seed • Embryo is the young plant